I have noticed recently that when I play (set mode: normal mode) that when night falls or when I enter a cave (times when monsters typically appear) I don't see any monster mobs spawn at all, I would even wonder in a very dark distance for some time but i don't see anything. Today I have also noticed that no fishes and horses are spawning just dolphins and turtles, pigs, sheep, chicken, cows, lamas, squids and villagers. This is unusual because before I would see lots of mods, I then decided to change the mod to hard and then easy to see any effects but there was none. I have never played on peaceful in this world and I have kept it like that so I don't know why it's like this.
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GoldenHelmet
migrated
I don’t have cheats on, so it’s locked onto enable.
GoldenHelmet
You could have monsters in hidden caves or pools of drowned converted from wandering zombies that have filled up the monster caps, blocking spawns for up to 80 blocks away. In 1.16 betas there are new despawning rules to help clear these automatically, but in 1.14 you have to hunt for them and find them because monsters do not despawn in the dark or if they have ever targeted a player or villager.
This ticket will be resolved as a duplicate of MCPE-21856.
Is Mob Spawning turned off in your world options?