Enemy teamates go invisible while backing

Super dangerous bug, ill try to catch it on film if I can but I was wondering if anyone else has this issue. This has nothing to do with my ping or fps, I have good computer and internet. But if someone is backing near by me while on open none fog of war turf, they will sometimes become invisible in the middle of backing. And unless I land a skill shot onto them they will remain invisible. Super dangerous bug that can easily lead to a death or major miss play. But you can still hear the sound effect of them backing.