Subform inside controlled section isn't controlled

There are multiple posts in the 6 & 7 forum about a problem with controlled sections: a subform inside a controlled section does not prevent editing even if the controlled section would prevent the editing.

Does anyone know if this is being fixed/has been fixed/has a workaround (short of copying all the fields to each form). I am using 8.0.1 and I can’t get it to work - all users with edit rights can edit the fields in the subform, regardless of the section edit formula.