I was playing Mystery Heroes competitive mode. It was Blizzard World. Round 1 we were defending, everything was fine.
Then starting round 2 I noticed that some of the friendly heroe models did not load, instead only floaty blue orbs were there. After I died, my own model also did not load so my screen was just the UI elements. Also the entire enemy team was only red orbs. I was Mercy and could not even see the beam, but I could see the UI showing who I am healing. After someone died some of the previously not loaded models loaded in but others disappeared.
I left the match and then rejoined and then it was fixed.
This was really crazy. I never had anything like this before. (well a few times in OW1 at game start models did not load for a few seconds on high ping but nothing like this)
I did not have any other issues during the game, no noticable lag or glitches etc.