When a wither skeleton is in the sun, it will flicker as "on fire" and "not on fire" very rapidly. Zombie pigmen had this issue in earlier versions, but this was recently fixed. However, the wither skeletons remain unfixed.
Linked issues
is duplicated by 8
MC-49415
Wither Skeletons burn for 1 frame sporadically in sunlight.
Resolved
MC-69750
Wither Skeletons constantly getting light on fire then diffusing in daylight.
Resolved
MC-90902
Wither Skeletons Fire Bug
Resolved
MC-102042
Wither skeletons burning in the overworld while its day
Resolved
MC-102109
Minecraft 16w20a bug
Resolved
3 more links
relates to 2
Comments 17
Relates to MC-60933 😃
7 more comments
Confirmed.