Mob spawning in guardian temples and witch huts is still broken in the 20w22a update for older maps, despite Mojangs attempt to fix the issue in this update. There are none of the expected mobs spawning (guardians, witches) but instead just have normal mob spawns.
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Thank you for your report!
However, this issue is a Duplicate of MC-186096 - please read the moderator note on that ticket.
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