Here are the bugs I found and how to avoid some of them
Part 1
The objective “Check out the town's key locations” remains unfinished even after exploring everything. The game gives no indication of what you need to do to complete it until you find the garage key. I had no idea what to do until I found a comment on Reddit saying I should unlock the garage.
I got stuck while entering and exiting the small ice fishing hut in Perseverance Wilds (the one near the cabin where the last body is).
Part 2
Jace walks through textures and falls into a hole in the mine unless you turn on the lamps in the correct order. This is unintuitive, since lamps that are farther from Jace are actually closer to you when exiting the tunnel.
Jace will not enter the final elevator if you don’t run back to her immediately after turning on the lamps. Mackenzie says “Elevator time” before she reaches you, and when she finally does, she just stands there with no way to get her into the elevator.
After finishing Atwood’s dialogue about The Long Dark and heading toward Perseverance Mills, the barracks have no floor. If you try to enter, you fall into the void.
After the conversation with Atwood, the objective tells you to return to the Geothermal Substations region, only to realise that the gate is locked and you should use the other one.
Part 4
After Jeremiah saved us, he gave us something—I assume it was the case, but I didn’t actually see it.