diff --git a/.github/workflows/cypress.yml b/.github/workflows/cypress.yml
index 5a6223b20..59c096836 100644
--- a/.github/workflows/cypress.yml
+++ b/.github/workflows/cypress.yml
@@ -18,7 +18,7 @@ jobs:
         core:
           - {name: 'WP latest', version: 'latest'}
           - {name: 'WP minimum', version: 'WordPress/WordPress#6.1'}
-          # - {name: 'WP trunk', version: 'WordPress/WordPress#master'}
+          - {name: 'WP trunk', version: 'WordPress/WordPress#master'}
     steps:
     - name: Checkout
       uses: actions/checkout@v4
diff --git a/tests/cypress/integration/image-processing/image-generation-openai-dalle.test.js b/tests/cypress/integration/image-processing/image-generation-openai-dalle.test.js
index f55bd7680..bd19fbf27 100644
--- a/tests/cypress/integration/image-processing/image-generation-openai-dalle.test.js
+++ b/tests/cypress/integration/image-processing/image-generation-openai-dalle.test.js
@@ -57,7 +57,7 @@ describe( 'Image Generation (OpenAI DALL·E) Tests', () => {
 		} );
 
 		// Open post settings sidebar.
-		cy.openDocumentSettingsSidebar();
+		cy.openDocumentSettingsSidebarCustom();
 
 		// Find and open the Featured image panel.
 		const panelButtonSelector = `.components-panel__body .components-panel__body-title button:contains("Featured image")`;
diff --git a/tests/cypress/integration/language-processing/classify-content-ibm-watson.test.js b/tests/cypress/integration/language-processing/classify-content-ibm-watson.test.js
index 578b153da..bd715c7e0 100644
--- a/tests/cypress/integration/language-processing/classify-content-ibm-watson.test.js
+++ b/tests/cypress/integration/language-processing/classify-content-ibm-watson.test.js
@@ -125,7 +125,7 @@ describe( '[Language processing] Classify content (IBM Watson - NLU) Tests', ()
 		} );
 
 		// Open post settings sidebar
-		cy.openDocumentSettingsSidebar();
+		cy.openDocumentSettingsSidebarCustom();
 
 		// Open Panel
 		const panelButtonSelector = `.components-panel__body .components-panel__body-title button:contains("ClassifAI")`;
@@ -214,7 +214,7 @@ describe( '[Language processing] Classify content (IBM Watson - NLU) Tests', ()
 		} );
 
 		// Open post settings sidebar
-		cy.openDocumentSettingsSidebar();
+		cy.openDocumentSettingsSidebarCustom();
 
 		// Open Panel
 		const panelButtonSelector = `.components-panel__body .components-panel__body-title button:contains("ClassifAI")`;
@@ -253,7 +253,7 @@ describe( '[Language processing] Classify content (IBM Watson - NLU) Tests', ()
 		} );
 
 		// Open post settings sidebar
-		cy.openDocumentSettingsSidebar();
+		cy.openDocumentSettingsSidebarCustom();
 
 		// Verify Each Created taxonomies.
 		[ 'categories', 'keywords', 'concepts', 'entities' ].forEach(
@@ -292,7 +292,7 @@ describe( '[Language processing] Classify content (IBM Watson - NLU) Tests', ()
 		} );
 
 		// Open post settings sidebar
-		cy.openDocumentSettingsSidebar();
+		cy.openDocumentSettingsSidebarCustom();
 
 		// Verify Each Created taxonomies.
 		[ 'categories', 'keywords', 'concepts', 'entities' ].forEach(
@@ -340,7 +340,7 @@ describe( '[Language processing] Classify content (IBM Watson - NLU) Tests', ()
 		} );
 
 		// Open post settings sidebar
-		cy.openDocumentSettingsSidebar();
+		cy.openDocumentSettingsSidebarCustom();
 
 		// Verify Each Created taxonomies with threshold 75.
 		[ 'categories', 'keywords', 'concepts', 'entities' ].forEach(
@@ -381,7 +381,7 @@ describe( '[Language processing] Classify content (IBM Watson - NLU) Tests', ()
 		} );
 
 		// Open post settings sidebar
-		cy.openDocumentSettingsSidebar();
+		cy.openDocumentSettingsSidebarCustom();
 
 		// Verify Each Created taxonomies with threshold 75 as we have already created terms with threshold 75. So, those are existing terms.
 		[ 'categories', 'keywords', 'concepts', 'entities' ].forEach(
@@ -435,7 +435,7 @@ describe( '[Language processing] Classify content (IBM Watson - NLU) Tests', ()
 		} );
 
 		// Open post settings sidebar
-		cy.openDocumentSettingsSidebar();
+		cy.openDocumentSettingsSidebarCustom();
 
 		// Verify Each Created taxonomies.
 		cy.verifyPostTaxonomyTerms( 'tags', threshold / 100 );
diff --git a/tests/cypress/integration/language-processing/classify-content-openapi-embeddings.test.js b/tests/cypress/integration/language-processing/classify-content-openapi-embeddings.test.js
index 37dd3e480..7589784f9 100644
--- a/tests/cypress/integration/language-processing/classify-content-openapi-embeddings.test.js
+++ b/tests/cypress/integration/language-processing/classify-content-openapi-embeddings.test.js
@@ -51,7 +51,7 @@ describe( '[Language processing] Classify Content (OpenAI) Tests', () => {
 		} );
 
 		// Open post settings sidebar.
-		cy.openDocumentSettingsSidebar();
+		cy.openDocumentSettingsSidebarCustom();
 
 		// Find and open the category panel.
 		const panelButtonSelector = `.components-panel__body .components-panel__body-title button:contains("Categories")`;
@@ -119,7 +119,7 @@ describe( '[Language processing] Classify Content (OpenAI) Tests', () => {
 		} );
 
 		// Open post settings sidebar.
-		cy.openDocumentSettingsSidebar();
+		cy.openDocumentSettingsSidebarCustom();
 
 		// Find and open the category panel.
 		const panelButtonSelector = `.components-panel__body .components-panel__body-title button:contains("Categories")`;
diff --git a/tests/cypress/integration/language-processing/excerpt-generation-azure-openai.test.js b/tests/cypress/integration/language-processing/excerpt-generation-azure-openai.test.js
index c693b8fd8..f7f9c54e3 100644
--- a/tests/cypress/integration/language-processing/excerpt-generation-azure-openai.test.js
+++ b/tests/cypress/integration/language-processing/excerpt-generation-azure-openai.test.js
@@ -70,7 +70,7 @@ describe( '[Language processing] Excerpt Generation Tests', () => {
 		} );
 
 		// Open post settings sidebar.
-		cy.openDocumentSettingsSidebar();
+		cy.openDocumentSettingsSidebarCustom();
 
 		// Find and open the excerpt panel.
 		const panelButtonSelector = `.components-panel__body .components-panel__body-title button:contains("Excerpt")`;
diff --git a/tests/cypress/integration/language-processing/excerpt-generation-googleai-gemini-api.test.js b/tests/cypress/integration/language-processing/excerpt-generation-googleai-gemini-api.test.js
index 9be2e7e07..ee2563294 100644
--- a/tests/cypress/integration/language-processing/excerpt-generation-googleai-gemini-api.test.js
+++ b/tests/cypress/integration/language-processing/excerpt-generation-googleai-gemini-api.test.js
@@ -59,7 +59,7 @@ describe( '[Language processing] Excerpt Generation Tests', () => {
 		} );
 
 		// Open post settings sidebar.
-		cy.openDocumentSettingsSidebar();
+		cy.openDocumentSettingsSidebarCustom();
 
 		// Find and open the excerpt panel.
 		const panelButtonSelector = `.components-panel__body .components-panel__body-title button:contains("Excerpt")`;
diff --git a/tests/cypress/integration/language-processing/excerpt-generation-openapi-chatgpt.test.js b/tests/cypress/integration/language-processing/excerpt-generation-openapi-chatgpt.test.js
index 475e5edf8..1de34549c 100644
--- a/tests/cypress/integration/language-processing/excerpt-generation-openapi-chatgpt.test.js
+++ b/tests/cypress/integration/language-processing/excerpt-generation-openapi-chatgpt.test.js
@@ -56,7 +56,7 @@ describe( '[Language processing] Excerpt Generation Tests', () => {
 		} );
 
 		// Open post settings sidebar.
-		cy.openDocumentSettingsSidebar();
+		cy.openDocumentSettingsSidebarCustom();
 
 		// Find and open the excerpt panel.
 		const panelButtonSelector = `.components-panel__body .components-panel__body-title button:contains("Excerpt")`;
@@ -212,7 +212,7 @@ describe( '[Language processing] Excerpt Generation Tests', () => {
 		} );
 
 		// Open post settings sidebar.
-		cy.openDocumentSettingsSidebar();
+		cy.openDocumentSettingsSidebarCustom();
 
 		// Find and open the excerpt panel.
 		const panelButtonSelector = `.components-panel__body .components-panel__body-title button:contains("Excerpt")`;
diff --git a/tests/cypress/integration/language-processing/text-to-speech-amazon-polly.test.js b/tests/cypress/integration/language-processing/text-to-speech-amazon-polly.test.js
index 27ffccf47..2de8bdab7 100644
--- a/tests/cypress/integration/language-processing/text-to-speech-amazon-polly.test.js
+++ b/tests/cypress/integration/language-processing/text-to-speech-amazon-polly.test.js
@@ -35,7 +35,7 @@ describe( '[Language Processing] Text to Speech (Amazon Polly) Tests', () => {
 		} );
 
 		cy.get( 'button[aria-label="Close panel"]' ).click();
-		cy.get( 'button[data-label="Post"]' ).click();
+		cy.openDocumentSettingsSidebarCustom();
 		cy.get( '.classifai-panel' ).click();
 		cy.get( '#classifai-audio-controls__preview-btn' ).should( 'exist' );
 	} );
diff --git a/tests/cypress/integration/language-processing/text-to-speech-microsoft-azure.test.js b/tests/cypress/integration/language-processing/text-to-speech-microsoft-azure.test.js
index bc3eab674..ec776de3d 100644
--- a/tests/cypress/integration/language-processing/text-to-speech-microsoft-azure.test.js
+++ b/tests/cypress/integration/language-processing/text-to-speech-microsoft-azure.test.js
@@ -35,7 +35,7 @@ describe( '[Language Processing] Text to Speech (Microsoft Azure) Tests', () =>
 		} );
 
 		cy.get( 'button[aria-label="Close panel"]' ).click();
-		cy.get( 'button[data-label="Post"]' ).click();
+		cy.openDocumentSettingsSidebarCustom();
 		cy.get( '.classifai-panel' ).click();
 		cy.get( '#classifai-audio-controls__preview-btn' ).should( 'exist' );
 	} );
diff --git a/tests/cypress/integration/language-processing/text-to-speech-openai-text-to-speech.test.js b/tests/cypress/integration/language-processing/text-to-speech-openai-text-to-speech.test.js
index 71cc9c29d..858293bf8 100644
--- a/tests/cypress/integration/language-processing/text-to-speech-openai-text-to-speech.test.js
+++ b/tests/cypress/integration/language-processing/text-to-speech-openai-text-to-speech.test.js
@@ -26,12 +26,11 @@ describe( '[Language Processing] Text to Speech (OpenAI) Tests', () => {
 	it( 'Generates audio from text', () => {
 		cy.createPost( {
 			title: 'Text to Speech test',
-			content:
-				"This feature uses OpenAI's Text to Speech capabilities.",
+			content: "This feature uses OpenAI's Text to Speech capabilities.",
 		} );
 
 		cy.get( 'button[aria-label="Close panel"]' ).click();
-		cy.get( 'button[data-label="Post"]' ).click();
+		cy.openDocumentSettingsSidebarCustom();
 		cy.get( '.classifai-panel' ).click();
 		cy.get( '#classifai-audio-controls__preview-btn' ).should( 'exist' );
 	} );
@@ -95,8 +94,7 @@ describe( '[Language Processing] Text to Speech (OpenAI) Tests', () => {
 
 		cy.createClassicPost( {
 			title: 'Text to Speech test classic',
-			content:
-				"This feature uses OpenAI's Text to Speech capabilities.",
+			content: "This feature uses OpenAI's Text to Speech capabilities.",
 			postType: 'post',
 		} );
 
diff --git a/tests/cypress/integration/language-processing/title-generation-azure-openai.test.js b/tests/cypress/integration/language-processing/title-generation-azure-openai.test.js
index 477e20b12..8cc538763 100644
--- a/tests/cypress/integration/language-processing/title-generation-azure-openai.test.js
+++ b/tests/cypress/integration/language-processing/title-generation-azure-openai.test.js
@@ -63,7 +63,7 @@ describe( '[Language processing] Title Generation Tests', () => {
 		} );
 
 		// Open post settings sidebar.
-		cy.openDocumentSettingsSidebar();
+		cy.openDocumentSettingsSidebarCustom();
 
 		// Find and open the summary panel.
 		const panelButtonSelector = `.components-panel__body.edit-post-post-status .components-panel__body-title button`;
diff --git a/tests/cypress/integration/language-processing/title-generation-googleai-gemini-api.test.js b/tests/cypress/integration/language-processing/title-generation-googleai-gemini-api.test.js
index 2d44f6bbf..6b097b83a 100644
--- a/tests/cypress/integration/language-processing/title-generation-googleai-gemini-api.test.js
+++ b/tests/cypress/integration/language-processing/title-generation-googleai-gemini-api.test.js
@@ -47,7 +47,7 @@ describe( '[Language processing] Title Generation Tests', () => {
 		} );
 
 		// Open post settings sidebar.
-		cy.openDocumentSettingsSidebar();
+		cy.openDocumentSettingsSidebarCustom();
 
 		// Find and open the summary panel.
 		const panelButtonSelector = `.components-panel__body.edit-post-post-status .components-panel__body-title button`;
diff --git a/tests/cypress/integration/language-processing/title-generation-openapi-chatgpt.test.js b/tests/cypress/integration/language-processing/title-generation-openapi-chatgpt.test.js
index 7c7419b66..3970b0678 100644
--- a/tests/cypress/integration/language-processing/title-generation-openapi-chatgpt.test.js
+++ b/tests/cypress/integration/language-processing/title-generation-openapi-chatgpt.test.js
@@ -44,7 +44,7 @@ describe( '[Language processing] Title Generation Tests', () => {
 		} );
 
 		// Open post settings sidebar.
-		cy.openDocumentSettingsSidebar();
+		cy.openDocumentSettingsSidebarCustom();
 
 		// Find and open the summary panel.
 		const panelButtonSelector = `.components-panel__body.edit-post-post-status .components-panel__body-title button`;
@@ -215,7 +215,7 @@ describe( '[Language processing] Title Generation Tests', () => {
 		} );
 
 		// Open post settings sidebar.
-		cy.openDocumentSettingsSidebar();
+		cy.openDocumentSettingsSidebarCustom();
 
 		// Find and open the summary panel.
 		const panelButtonSelector = `.components-panel__body.edit-post-post-status .components-panel__body-title button`;
diff --git a/tests/cypress/support/commands.js b/tests/cypress/support/commands.js
index dbf670dba..7fed9bc31 100644
--- a/tests/cypress/support/commands.js
+++ b/tests/cypress/support/commands.js
@@ -565,3 +565,51 @@ Cypress.Commands.add(
 		} );
 	}
 );
+
+/**
+ * Open the document settings sidebar.
+ *
+ * This has been modified to work with the new WordPress editor.
+ * Once the next version of Cypress WP Utils is released, we can
+ * remove this.
+ *
+ * @param tab - Name of the tab
+ *
+ * @example
+ * Open 'Post' tab
+ * ```
+ * cy.openDocumentSettingsSidebarCustom()
+ * ```
+ *
+ * @example
+ * Open 'Block' tab
+ * ```
+ * cy.openDocumentSettingsSidebarCustom('Block')
+ * ```
+ */
+Cypress.Commands.add( 'openDocumentSettingsSidebarCustom', ( tab = 'Post' ) => {
+	cy.get( 'body' ).then( ( $body ) => {
+		const $settingButtonIds = [
+			'button[aria-expanded="false"][aria-label="Settings"]',
+		];
+
+		$settingButtonIds.forEach( ( $settingButtonId ) => {
+			if ( $body.find( $settingButtonId ).length ) {
+				cy.get( $settingButtonId ).click();
+				cy.wrap( $body.find( $settingButtonId ) ).as( 'sidebarButton' );
+			}
+		} );
+
+		const $tabSelectors = [
+			`div[role="tablist"] button:contains("${ tab }")`,
+			`.edit-post-sidebar__panel-tabs button:contains("${ tab }")`,
+		];
+
+		$tabSelectors.forEach( ( $tabSelector ) => {
+			if ( $body.find( $tabSelector ).length ) {
+				cy.get( $tabSelector ).click();
+				cy.wrap( $body.find( $tabSelector ) ).as( 'selectedTab' );
+			}
+		} );
+	} );
+} );