I am attaching the start save for "Pimlico" from live branch on 3rd Aug '19.
I tried to upload via crash reporter but am not sure if it worked. I did not realise when making the reports that I had modded the map to a non standard size 384x384.
No other mods involved.
None of the many saves of the game played on this map will load without crashing, including this very first save which suggests a fundamental problem with the size now, which worked fine before. FYI
try to load map based on edited SandstoneDefault.yaml