I was in a comp game and wondered how an enemy player was able to get up on the moving platform on second point Horizon as Bastion without a Symmetra and had to go see what this was about. Apparently this has been reported in a Megathread before and nothing has been done about this. I have a clip but am unable to link it here for whatever reason.
Here is a video of it:
Here I combindet it with another bug to create the:
There are many many Sombra bugs and quite a few that are exploidable you finde everthing I know here: Even more Sombra Bugs in 1.26/1.27/1.28 [With Video's]
You also can put your video between two `` to link it without getting blocked.