When saving the infinite persistence component writes files in the background using MySessionPersistence.WriteAsync. This writes the entity to a temporary file in the background using m_persistWork.
However, when the temporary files are copied to the real safe location during MySessionPersistence.Apply and MySessionPersistence.SaveAs the persistence work is not waited for, meaning that an old (or empty?) (or partial?) version of the file might get put in the save directory.

During shutdown persist work is waited for, so this should only apply to unclean shutdowns or backups, but it still seems like a major issue.