Razorback Armada - Door to boss fight won't open

[Roobarb]

This has happened to me twice now - we fight our way to the entrance to the Razorback arena, someone goes up to the door console and ... nothing. The door won't open, back-tracking appears to have us locked into a single tile. Nothing changes on host migration or if new squad members join.

Screenshot below shows the door has turned green after a new squad member tried to unlock it but it still refuses to open. The only option is to abort the mission and try again. At least the Razorback cipher doesn't get used.

This is purely speculation but it may be caused by someone trying to open the door manually and failing (obviously). Both times I've noticed that the first player to reach the console appears to spend longer than it would take to activate a cipher.