Don't know if this is the right place for reporting bugs for new "Field-Level Security for Permission Sets During Field Creation (beta)" feature.
I found out that when you assign field permissions via object managers "Set Field-Level Security" button to a permission set, this permission is correctly set within the permission set. But when the permission set is used within a permission set group, the field permission is not rolled up to permission set groups combined permissions and therefore the user whom the permission set group is assigned has no access to the field
Case #43699969
@Marcel Harinck nope still having the same issues. The only good thing is that when you assign field permissions in sandbox and they are not rolled up to permission set group and you deploy it, they will roll up.
Support Case ended up that Salesforce was happy that I opened one but nothing happened after that.
