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Similar error here but w/o the crash, had my server up for about 6 hours, stopped it. After stopping, server log did not have the recently ended 6 hr session, and restarting it reverted to a previous save.
Same issue as OP, any possibility to get progress back?
I'm playing on the same account on the local client and the server, just matched the uuids and all. Tried restoring a backup and doing the same thing, but the problem still persists. Ended up just starting up the server, putting everything in a chest, and then clearing the different inventory once on my local client.
Having a little problem, when downloading my world save it gives a different save file instead of the current save. Basically, the save file that is given when downloaded doesn't match the world the server is running on. Would there be any way to get the current world on the server downloaded? I've tried a couple times to no avail.
Edit: everything about the world download is actually up to date (region files and all), but I believe the player.dat file is of a previous version, as it doesn't match with the world running in the server.
Also, massive thanks to aternos, this site has been incredibly easy to use! 
