yes.
It happened to us again just after the 4:46 backup, we were playing for approximately 1 hour and then got disconnected and came back in to find we lost all the progress. that was when that last backup was created an hour ago without any of the progress we had made.
The server is hosted on my machine
@Vis Yes the same happened to me, I went into the nether portal and saw nothing and then got disconnected and when I reconnected I lost hours of work 😞