1.21.70 and this is still very much an issue. No cave mobs spawns in caves below a river biome. Futher more, if a slime chunk is in a river biome, no slime will spawn, at any Y level.
Fullmakt
1.21.70 and this is still very much an issue. No cave mobs spawns in caves below a river biome. Futher more, if a slime chunk is in a river biome, no slime will spawn, at any Y level.