Not sure exactly how to write this up so created a picture.
It appears that Studio pulled an out of date log file to use as the most recent file listing but it is wrong.
The recent project list is stored in the main Studio configuration file, BambuStudio.conf in the relevant data folder (Help → Show Configuration Folder). Critically, beta vs. “release” versions store config. data in different locations – “BambuStudioBeta” and “BambuStudio” folders, respectively. So when switching between the two, they’re essentially separate programs as far as the settings go, including the local print history (not talking about MakerWorld stuff, which has its own history apparently).
HTH,
-Max