Starting yesterday, mobs seem to be not effected by sunlight. I have tested this with both skeletons and zombies (also drowned). Both mobs I have spawned with “summon” and the creative mode spawn eggs. I haven’t tested other mobs, but I imagine it applies to all hostile mobs. In addition, I am not sure if this also effects NATURALLY spawned mobs - I haven’t tested it.
Also, I have already attempted to change the weather and time several times, to no avail. All players have left the realm and upon rejoining later on, the issue still occurs. This is the first time I have seen this issue happen. I am guessing this is only a realm bug, but please comment if you find it is a local bug too. Attached are photos. (Photos are on MCPE but I’ve tested on Xbox too - can’t imagine platform matters in this case. Any way to fix this? Lastly, there is nothing above the mobs. I have tested in blank environments, despite transparent barrier blocks being above the mobs.

Edit: APPLIES TO PHANTOMS