Elevator Teleport Glitch?

[main_antagonist]

Somebody joined our squad and was afk, we went ahead without after asking what they're doing in chat with no response.
I was the host and near the objective the person who was afk for a few minutes finally started doing something and used the elevator and it swapped me back to the bottom of the elevator which was near the start of the mission????
Is this some sort of glitch or is a script that is intended to troll people who rush ahead without their team mates that doesn't factor afkers into the equation?
Has anybody else experienced this?
It strikes me as a similar script to what was used to punish vauban trolls who keep attaching bounce pads to their allies, if you attach too many bounce pads to allies vauban himself gets trampolined around instead of the person who is the grief target.
No idea what it was a glitch or script but either way it was super annoying have to run through the entire mission twice.