I've spent much too much time looking at the code, especially the map stuff, and I just can't find any issues. I also still can't replicate the bugs myself.
A few people have reported that Windows Git seems to not have any problems. If you're on Windows and are having problems, could you please try Windows Git for me and comment below with whether you still have map glitches and/or crashes.
Windows Git can be downloaded from the IF-Archive here:
There will be a new version soon, but again it won't have much more meaningful content from me, just some quality of life improvements. Again I apologise for the delay in actual new content guys, it's been a weird month for the game. This is the first time there have been bugs that it's quite possible are not the fault of coding mistakes.