このゲームは再起動が常識と聞いた
https://steamcommunity.com/sharedfiles/filedetails/?id=1191748287

> NEVER DO A SECOND LOAD!
> Always quit to the desktop between loads! This is a Unity game.
> Which means you can’t do a second load if you mod the game.

> A second-load is loading another map/save when one has been loaded before in the current session,
> including after quitting to the main menu. The game loads mods in two halves,
> one part on the Paradox logo, and one part during the loading screen.
> By loading a second time, the game forces mods to load themselves twice, which causes problems.

メインに戻ってアセットエディタ起動したら壊れた町が表示されたり