Edit: Also see: Scrollable card modal - not working
and
Fixed Navigation - #2 by delfs
Hmm, I think what you can do is not rely on the modal to support the scrolling and just scroll the modals page’s body
What formType is the card modal form?
The new 'formblank` type supports two new keys:
styleClassesPage - classes are applied to the outermost div of the page
styleClassesBody - classes are applied to the pages body, in the event you are using a form header slot, this allows better targeting.