Description

When I set define( 'SCRIPT_DEBUG', true ); in wp-config.php, if I insert a block with a slash, I get a warning in the console. Note that the block will be displayed correctly.

Warning: Can't perform a React state update on an unmounted component. This is a no-op, but it indicates a memory leak in your application. To fix, cancel all subscriptions and asynchronous tasks in a useEffect cleanup function.

If I insert a block from Toggle block inserter, the warning will not be displayed.

Step-by-step reproduction instructions

1. Set define( 'SCRIPT_DEBUG', true ); in wp-config.php
2. Open the developer tools in your browser.
3. Go to /wp-admin/
4. Go to the Add New page.
5. Click on editor content.
6. Type /heading.
7. Finally. You can see the following error in the developer tools.

Warning: Can't perform a React state update on an unmounted component. This is a no-op, but it indicates a memory leak in your application. To fix, cancel all subscriptions and asynchronous tasks in a useEffect cleanup function.
    in ForwardRef(RichTextWrapper) (created by ParagraphBlock)
    in ParagraphBlock (created by edit_Edit)
    in edit_Edit (created by WithToolbarControls(edit_Edit))
...

Screenshots, screen recording, code snippet

Environment info

• WordPress 5.8.1
  • I have not installed the Gutenberg plugin.
• macOS Big Sur 11.6
• Google Chrome 94.0.4606.81

Please confirm that you have searched existing issues in the repo.

Yes

Please confirm that you have tested with all plugins deactivated except Gutenberg.

Yes