I play Minecraft Java 1.16.1 Creative Mode on TLauncher.
I recently made a single player offline new world in which I did not change any setting except changing to Large Biomes, cheats on and Creative Mode. I've been looking for some mobs to kill but they're not at all spawning anywhere.
I've tried making spawners, using spawn eggs, but they appear for a split second then disappear.
I've also tried
/gamemode doMobSpawning true
Please help as soon as possible.