withFieldGroup#props does not support interfaces #1703
Description
Describe the bug
withForm has initially had the same issue, where interfaces are not assignable to Record<string, unknown>.
This is because interfaces do not have an index signature.
#1601 (and the following v1.13.1) fixed this issue for withForm. withFieldGroup was not yet merged at that state, and it seems like this fix was lost for withFieldGroup.
TanStack Form version
react-form v1.19.2