Hi everyone,
I was finally able to reproduce and fix the bug where you sometimes couldn't build additional courses (the courses wouldn't finish correctly and screw up the save game).
Sorry for the inconvenience,
Tim
Source: Steam Community (opens in a new tab)
Build and release context
Steam update times within 24 hours of this post. Matching dates do not confirm which build it describes.
Build 24790202 · public branch
Steam updated · First observed