This bug is only probably for me, but for some reason, my mobs don't appear. Not from /summon and not from spawn eggs. Naturally I have seen a couple, but then I rebooted my game and couldn't find any more natural spawns. I think it has a feeling with a texture file in my .minecraft folder I don't have. I have tried refreshing Minecraft, creating a new world and also using the Repair function in the Minecraft Installer, but none of that works.
EDIT: Just saw the reports that it should fix if I crank up my render distance (and it does fix), but those bugs say resolved, any my mobs still aren't showing up.