Labels

Mob spawn rate low or broken spawn rules

Mob Fall Trap not generating mobs

Animals are not spawning in new areas

All types of animals spawning in blocks and suffocating during terrain generation

Overworld mobs spawn in Nether (Xbox one converted world)

Mobs Not Spawning in Newly Created Areas

Mobs not spawning on lower Y levels

Mobs spawn underwather in kelp

Hostile Mobs spawn in Peaceful / broken difficulty setting in Realms

Mob Spawn Rate Low/Broken

Mop Spawn rates are still very low in 1.13.2

Passive mobs spawning on non-grass blocks

Spawning Algorithm Broken - Mobs Don't Do Block Checks

Pillagers don't respawn around the outpost

Mobs stop spawning over time if the render distance is less than 11

Raiders can spawn in inappropriate places

Mobs don´t massive spawnig in mob farms in server

Aquatic Mobs Don't Spawn In Warm Oceans

Pillager Patrols Never Spawn (Java 1.14.4+)

Wandering traders keep spawning at homes

Inappropriate amount of natural mobs spawned

Difficulty command breaks monster spawning

Zombies can spawn on Nether Fortresses and Bastions generated before 20w20b/20w20a/20w19a

Endermen spawn rate

Wolf is summoned below terrain

Nether fortress mob spawning broken, too many mobs

For almost all slime spawn attempts the game recalculates if a certain chunk is a slime chunk

Lags in version 1.16.101.01

Passive mobs are spawning with a low light level