So, this happened to me today.
We were in 3 players.
My computer is pretty slow so I was the last one to enter. I click deploy and after 15 sec I was in the game.
So, it showed me I had to press F6 to start.
I pressed F6 and… nothing happening, I didn’t respawn, the F6 UI tip disapeard and I see that i was able to defend the objective.
I run around and… an invisible player killed me and after he killed me he appeared on my screen.
Or mhm… his turret killed me, I don’t remember correctly.
But on the kill cam he was in front of me but it wasn’t 
After I respawned again everything worked perfectly.