I made a copy of my game by clicking File → Save as → Your computer → Keep the new project linked to this game…
After MyGame - Copy opened, I closed the project and opened the original MyGame. Then I realized there’s no sprites.
I checked the folder and found two files: mygame.json and mygame-copy.json, and an empty assets folder. I kept all files on my computer.
I checked everywhere (also using Windows search) and my files are nowhere to be found. Not even in the recycle bin.
I tested it again on another project and files are also gone. It happens only when game folder is on other drive than the basic folder in Preferences. I think it’s bug since I guess I lost all my files.