Mautic Form Themes not available in new version

Your software
My Mautic version is: 4.3.1
My PHP version is: 7.4
My Database type and version is: Maria 10.4

Your problem
My problem is:
After enabling grapejs and changing themes to allow the builder (adding “builder”: [“grapesjsbuilder”],), these themes are no longer available for forms.

Maybe someone knows how to fix this?
Thank you!