Wither skeletons spawn with 2 height airgap

[Hiracho]

I've seen this happen multiple time when they spawned and found numerous bones and a few wither skeleton heads just laying on the ground in the two high ceiling tunnels I've made through the nether fortress. seems like they don't realise they aren't puny normal skeletons anymore :)

[FlowerChild]

Will look into it!

[FlowerChild]

This is actually a vanilla bug. I'll think about whether to fix it and how (I know precisely what's doing it but it's tied in pretty heavily to how vanilla spawning works).

[FlowerChild]

Fixed for next release. As an added bonus I get the impression that this results in a greater effective number of wither skeletons spawning, given a bunch aren't dying almost immediately (may require additional tweaking later).