Because this fakeplayer check breaks every possible farm

If it's intended, can we have a config option to disable this please ?

Hm, that might be true. I suppose you'll have to disable ITTs mobheads if you want to autofarm them.

By moving the check at the top of the event, wither skulls would drop at a vanilla rate when farmed by fakeplayers. It would solve the problem but would also be inconsistent with the way the other heads drop (Just like vanilla I guess).

Yes, but I don't want it changed. As I said you can always turn off the modheads to disable it, or you can increase the drop-rate for manual farming to compensate.

Fair enough ! Well if there is nothing else to be said I guess we can close this issue ?