Slimes spawn, but despawn after it spawns.
All I can see is a flash of them.
Only happens to naturally spawned ones.
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duplicates
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Duplicate of MC-55260
This issue has been reported already. It has been linked to the original bugreport.
Please search before reporting any bugs, as it's likely that one exists already.
I've been noticing that no slimes have been spawning in my swamp. Good to know it's not just me.