I've been playing the expansion solo with a couple of additional mods.
These were the first missions I was in a position to complete.
One to drive the car back to the warp platform.
One to destroy a massive biter.
As soon as I complete either mission, I die. With an explosion crater appearing wherever I was.
I tried driving the car through the platform teleporter and also taking the long way around, same effect both times. Usually it's instant but I did manage to exit the car once on the other side. No difference.
Is this something you've encountered before? I unloaded all the other mods and it didn't change anything.