Players respawning too far away from the team is a known issue, but I feel the need to point out this in particular because it has happened several times in the same location instead of at random.
Our psyker died in the tunnel just before the trainyard event on ascension riser and respawned on the other side of the event. Forcing three players to fight through an entire event arena without their fourth teammate is particularly unreasonable, so this is much worse than simply having your teammate spawn further away.