Steps to Reproduce:

find a place without mob

activate a repeating_command_block with execute as @e[type=!player,type=!snowball] at @s run tp ~~~ 

/summon wither ~~~

/summon snow_golem ~ ~2 ~2

Observed Results:

Most of the time,the wither faces to the snow golem.It will keep under 1.20.1,but in this edition the wither spins sometimes.

It doesn't a rendering error and the sight spinning has make a lot of wither cages unsafe

Expected Results:

When a wither has a only target,it will face to the target forever.

Guess:

Interrupt of wither's target