I’ve gotten stuck behind the back bridge fighting the Galactic Emperor several times with a character that can’t get unstuck. You shouldn’t have to quit the match to get unstuck.
However if there was a suicide switch then you know trolls will join matches and suicide all the extra lives away and quit.
if your in PVP its the B button to teleport back to base
but PVE needs this same option to teleport back to the respawn pads
Down on d pad for xbone