Sometimes when creating new requests (by duplicating them in my case) and dragging them to different folders, they might get lost.

Here is a JSON export of my initial collection:
Restfox_2025-07-04.json

And here are the steps: I first duplicate a request, then drag it to another folder and try to move it to the end of this folder. In this step, the source request disappears. After restarting Restfox, the requests are back again.