was in the nether where i got shot at by some blazes in my nether fortress spawn room and when i came back i've noticed the light from the fire was still there while the fire itself is gone playing in realms so i've got the latest update we've noticed it first in a tree in the overworld but i forgot where in the world mobs do not spawn.

update when you place fire on the block where the light source is suppose to be and remove the fire it will update and fix it