Description

On load time the block editor displays an unwanted scroll bar. Please take a look at the screenshot below.

I'm tagging this issue with zoom-out tag because this seems to be the result of the changes introduced in #67126

Specifically this line:

Step-by-step reproduction instructions

1. Use Gutenberg trunk and TT5 theme.
2. Browse theme style variations in the sidebar.
3. Observe the unwanted scroll bars while the block editors are loading

Screenshots, screen recording, code snippet

Environment info

• WordPress 6.7.1
• Gutenberg trunk

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

Please confirm which theme type you used for testing.

• Block
• Classic
• Hybrid (e.g. classic with theme.json)
• Not sure