Editor History: Site title and tagline blocks undo one character at a time

[jeyip]

Description

Undoing a site tagline or site title block reverts text one character at a time instead of in larger "chunks" like in the paragraph block.

Step-by-step reproduction instructions

Block Editor

1. Navigate to the post editor
2. Add a site tagline or site title block
3. Add text to the site tagline
4. Undo the changes
5. Verify that reversions occur one character at a time

Site Editor

1. Enable full site editing by activating the Gutenberg plugin and an FSE enabled theme (Ex. Quadrat)
2. Navigate to the site editor
3. Add a site tagline or site title block
4. Add text to the site tagline
5. Undo the changes
6. Verify that reversions occur one character at a time

Screenshots, screen recording, code snippet

Site tagline block not working

Paragraph block working

Environment info

No response

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

[ndiego]

I can confirm this is still an issue in Gutenberg trunk as of today.

[paulopmt1]

Hey @youknowriad and @ellatrix, I'm learning Gutenberg in my 20% time and I'm curious about your feedback on this POC for fixing this title issue.