Players or entities sometimes become invisible after death

The bug

I was playing with my brother and he'd die, and then he couldn't see me anymore as I played.  This happened many times.  I experienced it in 18w45a again after I died and tp'd to my brother.  I was invisible to him.  I died again, tp'd again during a pillager raid. This time, Though I was visible to him, Both the Villagers and Illagers nearby were invisible to me.