Upon finding out that 1.16.1 was out I made a new world on 1.16.1 hoping to make it my new survival world. I put my seed into chunkbase and hollowed out a 3 tall are for slimes to spawn. I lit it up to prevent other mobs from spawning. No slimes have spawned in the hour of me waiting 24 blocks away from the chunk.
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Nope, still got a problem

Seed and coordinates?

The seed is --6218075277800750635 and the coords are -17,-17 to -32,-32
Does MC-153326 describe your issue?

I've checked and yes, it does. Is there any way around this that doesn't involve digging up to the surface?

I tested in a creative world having no roof and still I got 1 small slime at most in 15 minutes.
I think the mob cap was full...