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diff --git a/Collapse file: packages/e2e-tests/plugins/interactive-blocks/tovdom/processing-instructions.js
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diff --git a/Collapse file: packages/e2e-tests/plugins/interactive-blocks/tovdom/render.php
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diff --git a/Collapse file: packages/interactivity/CHANGELOG.md
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diff --git a/Collapse file: packages/interactivity/src/init.ts
‎packages/interactivity/src/init.ts‎
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@@ -1,5 +1,6 @@
 const processingInstructions = `
 	<div>
+		<div>Processing instruction is <?xpacket ##last-child## ?></div>
 		<?xpacket ##1## ?>
 		<div data-testid="it should keep this node between processing instructions">
 			Processing instructions inner node
 
@@ -12,6 +12,7 @@
 
 <div data-wp-interactive="tovdom">
 	<div data-testid="it should delete comments">
+		<div>Comment is <!-- ##last-child## --></div>
 		<!-- ##1## -->
 		<div data-testid="it should keep this node between comments">
 			Comments inner node
 
@@ -8,6 +8,7 @@
 
 -   Fix `store()` types to support typing it without passing a store part. ([#70296](https://github.com/WordPress/gutenberg/pull/70296))
 -   Fix captured errors in `withScope` for passed generators. ([#70303](https://github.com/WordPress/gutenberg/pull/70303))
+-   Fix parsing of HTML comments without siblings. ([#70304](https://github.com/WordPress/gutenberg/pull/70304))
 
 ## 6.24.0 (2025-05-22)
 
 
@@ -25,7 +25,7 @@ export const getRegionRootFragment = ( region: Element ): ContainerNode => {
 };
 
 // Initial vDOM regions associated with its DOM element.
-export const initialVdom = new WeakMap< Element, ComponentChild[] >();
+export const initialVdom = new WeakMap< Element, ComponentChild >();
 
 // Initialize the router with the initial DOM.
 export const init = async () => {