Certain mob spawners continue to spawn mobs when game is in peaceful mode.
Evokers
Vindicators
Shulkers
sample world attached
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Fun fact: Evokers, vindicator and shulkers are still supposed to spawn in peaceful difficulty, just that they will not attack you. I’m pretty sure this is intentional.
Thanks, per the wiki I assumed they should disappear or not spawn at all.
"In Peaceful difficulty, spawners still appear and work, but any spawned hostile mobs disappear immediately after spawning. Zombie pigmen, magma cubes, and ghasts do not spawn at all."
Evokers and vindicators do not despawn in peaceful per MCPE-20990. I believe shulkers do not despawn so that you can still get shulker boxes in peaceful survival worlds.
Still broken in 1.14.0.1