Noticed this when updating a data pack from 1.16.1 to 1.18.1 inconsistency in the way Enderman acted. 

Running the following commands in 1.16.1 will result in all Enderman attacking the closest player. Running this command in 1.17 and beyond will result in nothing, even though they should work the same.

execute as @e[type=enderman] at @s run data modify entity @s AngryAt set from entity @p UUID
execute as @e[type=enderman] at @s run data merge entity @s {AngerTime:99999}

There were no changes noted in any update between 1.16.1 and 1.18.1 (did not track exact version this started on) noting any changes to the way Endermen anger works, thus I assume this is a bug.