May affect older versions, have not tested

Mobs appear to stop all pathfinding and behavior in general while their data is being modified with commands.

One way to reproduce:

Create a function file called test:modify containing the following text:
{{}}

data merge entity @s {IsImmuneToZombification:0b}

scoreboard players add @s corrupt_time 1

execute as @s store result entity @s TimeInOverworld int 1.0 run scoreboard players get @s corrupt_time

Then, using either a repeating command block or the #minecraft:tick function tag, loop the function every tick.

You should see that all piglins in the world stop moving completely due to their TimeInOverworld tag being changed to a different value every tick.