I’m having trouble with drowned not spawning from a spawner I suspect due to y level requirements. I had a look online but couldnt find any blockdata about spawning requirements. Is it possible? If not is there a fabric 1.20.1 mod that will let me do the same thing?
You need to do that, it is actually a bug that was fixed in a snapshot two weeks ago: https://bugs.mojang.com/browse/MC-131646 So it won’t be in 1.20.1, but in 1.20.3 when it is released. You could search if a mod backports/also adds that fix.