Sure, i could agree, if it'd b a whole line copied from base staff into 25m resulting copies, but not HALF.
Moreover, im pretty sure that they made the unglyphed staff FIRST.
In that case, a copypaste's not possible if half of the copies are intentionally modified and half of them aren't.
Or if it'd be done in 2 patch periods, sure. Unfortunately all are 15.1
Sorry, but making this a 'bug' would require using too many if's and 'maybe's.