If tl;dr - start at the bottom..
I've found I can cause Underrail to do a hard lockup (have to end the task) if I do things a peculiar way (that is probably very 'not normal') but isn't 'cheating' either.
My PC has approx. 300 stealth with his Cloak active.
In the University, I can sneak into the Deep Caverns elevator room (having avoided starting Strange Tremors), hack the elevator button, and press it. The Faceless immediately assault. I can 'ride out' the assault by keeping in stealth and staying out of the way.
After it is over, I can sneak back out of the elevator room (doing so via the stairs and not via the passenger elevator going up - I haven't tried that way yet). From there I can sneak back into the vent and get to the West Wing.
In the West Wing, I drop out thru the hole in the floor.
From there I can go visit the other two elevators - the one at the Hanging Rat pub, and the other one near SGS. (Basically i was curious if either one now had power and had become operational)
I can visit the one at the Hanging Rat with no problems (including pressing the power button).
BUT - If I merely enter the zone of the Deep Cavern elevator near SGS - Underrail does a hard lockup. I can't do anything besides step into that zone - then boom - lockup. Have to end task.
Probably an unorthodox thing to do - but since it locks up I figured I should at least report it..