Playing splitscreen in any of the Star Wars games right now has major movement/ visual issues. All over. All the menus, cutscenes, and even flying the ships. Dont claim it supports local multipalayer if you never actually configured it to work this way. Its impossible to play.
More specifically it seems like player 2 was never tested. If llayer 1 opens any menues, it can freeze p2. If p2 opens any menus they could freeze p1 or themselves in the menu. P2 respawning from the menu to unfreeze only overlaps the menu over their hud and freezes them at spawn. Of eother person triggers a cutseen it freezes the other in place.
I haven't seen if the planes on splitscreen have been fixed yet but last year those broke on splotscreen so bad. Please please please please test/update splitscreen.