Required file in hidden conditional group not validating

I have a problem with the plugin.
When I’m using a required file field in a conditional group, it doesn’t allow the form to be submit when hidden. It doesn’t validate and when I do the action to unhide the group, there’s the red text of “This field can’t be empty”.

Example:
[select* reg-ticket “ICOM member” “Non ICOM member” “Student” “Day pass”]
[group reg-group-student]
[file* reg-student]
[/group]

The group is only shown when student is selected but seemingly requires validation for all selections.
All IDs are unique in the form.

CF7 5.4, CF7CF 2.0