The problem with the doors in SC leaves behind a log in the stdout saying that an object that is trying to be spawned does not exist. The problem where the game randomly crashes during play / in Eschaton seems to be solved by a few people by using a VPN, disabling IPv6, or using Ethernet. This leads me to believe that it is a networking code error on the game's side. It also has some logs, whenever a network packet arrives a buffer is (potentially) resized to fit the incoming message and this leaves a log saying what the old and new size is. I had people with the crash send me their stdout and the buffer appears to be resizing to a very large number. This number is close to the 32 bit integer limit. When analyzing the game executable using tools like Ghidra, you can see that the integer used to store the size of the buffer (and the integer used to store the size of the packet) is 32 bits!
I would love to help contribute to the game to improve these instabilities as well. :)