Wither Skeletons brought to the Overworld via Nether Portal will attempt to hide from daylight by seeking shade or water. This is due to the fact Wither Skeletons share the same entity ID as Skeletons.
Steps to Reproduce:
1. Make a new Creative world.
2. Create the structures show in the pictures.
3. Construct a Nether Portal and enter it.
4. Spawn a few Wither Skeletons directly in the portal frame using a Skeleton spawn egg.
5. Go back to the Overworld (make sure it's day), break the Nether Portal, and fill it in with solid blocks.
6. Observe how the Wither Skeletons run for the shade and water like a normal Skeleton, despite being fire proof.
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Comments
Although the wither skeletons can't burn, they want to stay out of sunlight.
A good bug that needs to be resolved is the daylight sensor still outputting redstone signals under transparent blocks or underwater at night
This shouldn't be intended in my opinion, but this is normal.
Wither Skeletons have some many problems, it stupid. They should be unique mobs with their own entity ID. This would resolve everything.
A mob that can't burn hides from the daylight, as this is 'working as intended'? Are you sure?
"Old habits die hard", perhaps? 😉
Confirmed.