If sombra puts her translocator on the ground infront of the payload and then the payload keeps pushing forward. She can teleport in to the payload when it is above the translocator and then stay there. She can also shoot out of it and she is contesting.
https :// plays .tv/s /Lrbr5MDi0QGl (here is the link if you want to see it, just remove the spaces)
I have a list with Sombra bugs and exploits
This bug and a video of it is on bug 13 on the list and you can pull Sombra out with any kind of grav (zarya amd orisas
I hope this helps till Blizzard finally fixes this any all other bugs.