Started playing again and getting quite often these kinds of "transition failed". They all seem to be autosave related since the errors produced are like:

Game Version: 1.1.5.11
Error: System.Exception: Failed to save game 'autosave'. Exception: System.IO.IOException: The process cannot access the file 'screenshot.png' because it is being used by another process.
at System.IO.Directory.DeleteHelper(String fullPath, String userPath, Boolean recursive, Boolean throwOnTopLevelDirectoryNotFound, WIN32_FIND_DATA& data)
at System.IO.Directory.Delete(String fullPath, String userPath, Boolean recursive, Boolean checkHost)
at dxt.ap2(String A_0, Boolean A_1, Boolean A_2) ---> System.IO.IOException: The process cannot access the file 'screenshot.png' because it is being used by another process.
at System.IO.Directory.DeleteHelper(String fullPath, String userPath, Boolean recursive, Boolean throwOnTopLevelDirectoryNotFound, WIN32_FIND_DATA& data)
at System.IO.Directory.Delete(String fullPath, String userPath, Boolean recursive, Boolean checkHost)
at dxt.ap2(String A_0, Boolean A_1, Boolean A_2)
--- End of inner exception stack trace ---
at dmv.LogAndThrow[T](Exception innerException, LogSeverity severity, String message, Object[] messageArgs)
at dxt.ap2(String A_0, Boolean A_1, Boolean A_2)
at bw6.ada(ev5 A_0)
at bo0.f(ev5 A_0)
at b3f.ada(ev5 A_0)
at bo0.f(ev5 A_0)

Never ever had this problem in earlier versions. What gives?

Found the culprit and it was of course everyone's favourite Microsoft garbage backup software, OneDrive.

OneDrive backs up the user Documents folder. Which contains My Games. Which contains Underrail Saves folder. Every single time the game saves OneDrive syncs it to the cloud and that causes all sorts of issues.

Solution: Stop using the garbage that is OneDrive (or at least exclude the "My Games" folder from it).

i got a fun onedrive message that pops up while playing the game that says ..

your last backup was 54 years ago, bla bla bla onedrive or your computer which is more recent or something to that effect. Since i'm 55 years old, maybe i was playing the game back before computers when i was 1 year old.