Started the world normally on normal mode, I had a few drowned zombies while setting up a starter base. Went caving and no mobs spawned only mobs I saw were from a zombie spawner. I have tried reloading the chunks by changing my settings and by traveling to different parts of the world and still nothing. Even travelling by night no mobs spawn around me.
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We're tracking this issue in MC-279245, so this ticket is being resolved and linked as a duplicate.
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