Datapacks not allowing mobs to burn in sunlight

On a realm, I have been encountering a problem with hostile mobs not burning during daylight. I have done some testing, and it seems to do with having any sort of data pack enabled. It isn't a singular data pack that is causing a problem, it is all data packs that are turned on. The issue only started yesterday, and I have been using the same data packs a day before with no issue. I tried the data packs on a singular player world, and encountered no problem.