Set autoload to 'no' for previously activated themes using upgrade routine

src/wp-admin/includes/upgrade.php

@@ -843,6 +843,10 @@
 		upgrade_640();
 	}
 
+	if ( $wp_current_db_version < 57200 ) {
+		upgrade_650();
+	}
+
 	maybe_disable_link_manager();
 
 	maybe_disable_automattic_widgets();
@@ -2349,6 +2353,37 @@
 	}
 }
 
+/**
+ * Executes changes made in WordPress 6.5.0.
+ *
+ * @ignore
+ * @since 6.5.0
+ *
+ * @global int $wp_current_db_version The old (current) database version.
+ * @global wpdb $wpdb                  WordPress database abstraction object.
+ */
+function upgrade_650() {
+	global $wp_current_db_version, $wpdb;
+
+	if ( $wp_current_db_version < 57200 ) {
+
+		$stylesheet = get_stylesheet();
+
+		// Set autoload=no for the previous all themes.
+		$theme_mods_options = $wpdb->get_col(
+			$wpdb->prepare(
+				"SELECT option_name FROM $wpdb->options WHERE autoload = 'yes' AND option_name != %s AND option_name LIKE %s",
+				"theme_mods_$stylesheet",
+				$wpdb->esc_like( 'theme_mods_' ) . '%'
+			)
+		);
+
+		$autoload = array_fill_keys( $theme_mods_options, 'no' );
+		$autoload[ "theme_mods_$stylesheet" ] = 'yes';
+		wp_set_option_autoload_values( $autoload );
+	}
+}
+
 /**
  * Executes network-level upgrade routines.
  *

src/wp-includes/version.php

@@ -23,7 +23,7 @@
  *
  * @global int $wp_db_version
  */
-$wp_db_version = 56657;
+$wp_db_version = 57200;
 
 /**
  * Holds the TinyMCE version.