You are able to spawn Evokers and Vindicators in peaceful difficulty but not Vexs. Therefore, It either WAI for the ability to spawn Evokers, Vindicators and Vexs in peaceful difficulty or they should NOT spawn at all, because they are hostile mobs just like Zombies and Creepers.
Linked issues
is duplicated by 12
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Comments 5
This is a parity break from the Java edition. Evokers and Vindicators won't attack you unless you attack them first in peaceful difficulty.
Relates to MCPE-20719