diff --git a/frontend/src/scenes/notebooks/Nodes/NotebookNodeReplayTimestamp.tsx b/frontend/src/scenes/notebooks/Nodes/NotebookNodeReplayTimestamp.tsx
index ec49f4445d005..799f2b128ed19 100644
--- a/frontend/src/scenes/notebooks/Nodes/NotebookNodeReplayTimestamp.tsx
+++ b/frontend/src/scenes/notebooks/Nodes/NotebookNodeReplayTimestamp.tsx
@@ -1,5 +1,5 @@
 import { mergeAttributes, Node, NodeViewProps } from '@tiptap/core'
-import { NodeViewWrapper, ReactNodeViewRenderer } from '@tiptap/react'
+import { callOrReturn, getExtensionField, NodeViewWrapper, ReactNodeViewRenderer } from '@tiptap/react'
 import { NotebookNodeType, NotebookTarget } from '~/types'
 import {
     sessionRecordingPlayerLogic,
@@ -75,6 +75,25 @@ export const NotebookNodeReplayTimestamp = Node.create({
     group: 'inline',
     atom: true,
 
+    serializedText:
+        () =>
+        (attrs: { playbackTime: number }): string => {
+            // timestamp is not a block so `getText` does not add a separator.
+            // we need to add it manually
+            return `${formatTimestamp(attrs.playbackTime) || '00:00'}:\n`
+        },
+
+    extendNodeSchema(extension) {
+        const context = {
+            name: extension.name,
+            options: extension.options,
+            storage: extension.storage,
+        }
+        return {
+            serializedText: callOrReturn(getExtensionField(extension, 'serializedText', context)),
+        }
+    },
+
     addAttributes() {
         return {
             playbackTime: { default: null, keepOnSplit: false },
diff --git a/frontend/src/scenes/notebooks/Notebook/utils.ts b/frontend/src/scenes/notebooks/Notebook/utils.ts
index 0134cace7b23a..c50d80be77b8d 100644
--- a/frontend/src/scenes/notebooks/Notebook/utils.ts
+++ b/frontend/src/scenes/notebooks/Notebook/utils.ts
@@ -11,7 +11,6 @@ import {
 import { Node as PMNode } from '@tiptap/pm/model'
 import { NodeViewProps } from '@tiptap/react'
 import { NotebookNodeType } from '~/types'
-import { formatTimestamp } from 'scenes/notebooks/Nodes/NotebookNodeReplayTimestamp'
 
 export interface Node extends PMNode {}
 export interface JSONContent extends TTJSONContent {}
@@ -114,11 +113,7 @@ export const textContent = (node: any): string => {
         'ph-query': customOrTitleSerializer,
         'ph-recording': customOrTitleSerializer,
         'ph-recording-playlist': customOrTitleSerializer,
-        'ph-replay-timestamp': (props): string => {
-            // timestamp is not a block so `getText` does not add a separator.
-            // we need to add it manually
-            return `${formatTimestamp(props.node.attrs.playbackTime) || '00:00'}:\n`
-        },
+        'ph-replay-timestamp': customOrTitleSerializer,
         'ph-survey': customOrTitleSerializer,
     }