Description

Can't seem to get a custom class to appear for the experimental form block.

Step-by-step reproduction instructions

1. Check Form and input blocks in Gutenberg > Experiments
2. In a new page, add /form block
3. In the block panel, add a custom CSS class in Additional CSS Class(es)
4. Publish page
5. View console and notice the CSS class is not there

Screenshots, screen recording, code snippet

Environment info

• wp 6.4.2
• gutenberg 17.3.0
• chrome
• mac sonoma

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