Be careful when transferring items on private world - ”failed to load world”

This one was new to me - I was transferring items on a private server, exited, changed char, pressed ”play” and immediately got an error message saying it failed to load my world. Clicked on private but my private server had been wiped.

Just want to put this out there. Like I said, I haven’t experienced this before. Usually it’s crashes or server disconnects.