The bug
Originally I had a data pack but I narrowed down to 3 commands with 2 being ran every tick.
First command:
scoreboard objectives add Health dummyRepeating command block:
execute as @e[type=minecraft:wither_skeleton,sort=nearest] store result score @s Health run data get entity @s Health 1Chain command block attached to the repeating one:
execute as @e[type=minecraft:wither_skeleton,sort=nearest] store result entity @s Health float 1 run scoreboard players get @s HealthThe Wither Skeleton stops being able to get to the survival mode player when those 2 commands are active.
This didn't effect Zombies.
I didn't try other mobs.
I asked people to confirm that this is not only happening on my Windows 10 PC.
And it appears to be a bug in the code instead of my installation.
How to reproduce
Enter the following command into a powered, repeating command block:
data merge entity @e[type=wither_skeleton,limit=1,sort=nearest] {Test:0}Spawn a wither skeleton:
/summon wither_skeletonSwitch to survival mode:
/gamemode survival→ ❌ The wither skeleton has trouble pathfinding to you
Linked issues
is duplicated by 4
MC-151468
replaceitem command stopping skeletons from attacking players
Resolved
MC-196094
Skeletons with their offhand item constantly being modified would never attack with their bow or strafe
Resolved
MC-225902
speed effect made skeletons slower
Resolved
MC-262780
If you keep changing the NBT Skeltons will not shoot arrows
Resolved
Confirmed in 1.16.1 and 20w29a. It seems the issue here is that modifying a wither skeleton's NBT resets its pathfinding, hence it can be reproduced using a single repeating command:
Only wither skeletons targeting a player (or another entity) are affected. Their wandering AI still functions correctly, and mobs other than wither skeletons don't appear to be affected at all.