Zombies and skeletons walking around in the middle of the day and not burning. Making the time go faster to the next day or relaunching the world temporarily solves the issue.

Also, even though it's dark outside it still says I can only sleep at night, or during thunderstorms. Saving and joining the world and suddenly it's morning/daytime, or I can sleep when the sun is still up. Relaunching the world also makes this go away for a while.

I'm still not really sure if it's this mod causing this. I don't have any mods that affect mobs or sleep or anything like that, and don't have any other time mods.

I'm using the latest version of the mod on Minecraft 1.20.4. Using 1800 seconds for day and night so nothing crazy.