diff --git a/packages/block-editor/src/components/rich-text/event-listeners/enter.js b/packages/block-editor/src/components/rich-text/event-listeners/enter.js
index f2308deddd676a..75a265f8da9b2e 100644
--- a/packages/block-editor/src/components/rich-text/event-listeners/enter.js
+++ b/packages/block-editor/src/components/rich-text/event-listeners/enter.js
@@ -29,6 +29,7 @@ export default ( props ) => ( element ) => {
 				onChange( insert( value, '\n' ) );
 			}
 		} else if ( onSplitAtEnd && start === end && end === text.length ) {
+			// This is no longer used anywhere. Deprecate?
 			event.preventDefault();
 			onSplitAtEnd();
 		} else if ( onReplace && onSplit ) {
diff --git a/packages/block-library/src/post-title/edit.js b/packages/block-library/src/post-title/edit.js
index fdfb8e7c2c6cd2..a7137be35d4420 100644
--- a/packages/block-library/src/post-title/edit.js
+++ b/packages/block-library/src/post-title/edit.js
@@ -17,7 +17,6 @@ import {
 } from '@wordpress/block-editor';
 import { ToggleControl, TextControl, PanelBody } from '@wordpress/components';
 import { __ } from '@wordpress/i18n';
-import { createBlock, getDefaultBlockName } from '@wordpress/blocks';
 import { useEntityProp, store as coreStore } from '@wordpress/core-data';
 import { useSelect } from '@wordpress/data';
 
@@ -25,7 +24,6 @@ export default function PostTitleEdit( {
 	attributes: { level, levelOptions, textAlign, isLink, rel, linkTarget },
 	setAttributes,
 	context: { postType, postId, queryId },
-	insertBlocksAfter,
 } ) {
 	const TagName = level === 0 ? 'p' : `h${ level }`;
 	const isDescendentOfQueryLoop = Number.isFinite( queryId );
@@ -57,9 +55,6 @@ export default function PostTitleEdit( {
 		postId
 	);
 	const [ link ] = useEntityProp( 'postType', postType, 'link', postId );
-	const onSplitAtEnd = () => {
-		insertBlocksAfter( createBlock( getDefaultBlockName() ) );
-	};
 	const blockProps = useBlockProps( {
 		className: clsx( {
 			[ `has-text-align-${ textAlign }` ]: textAlign,
@@ -77,7 +72,7 @@ export default function PostTitleEdit( {
 				value={ rawTitle }
 				onChange={ setTitle }
 				__experimentalVersion={ 2 }
-				__unstableOnSplitAtEnd={ onSplitAtEnd }
+				disableLineBreaks
 				{ ...blockProps }
 			/>
 		) : (
@@ -100,7 +95,7 @@ export default function PostTitleEdit( {
 					value={ rawTitle }
 					onChange={ setTitle }
 					__experimentalVersion={ 2 }
-					__unstableOnSplitAtEnd={ onSplitAtEnd }
+					disableLineBreaks
 				/>
 			</TagName>
 		) : (