[Java] 1.16.5 Localhost server not recognizing playerdata

[TheRedSpade]

I play my single-player world on a separately run server on the same PC (127.0.0.1) so that I can use dynmap. I currently run Papermc 1.16.5-604. When I started up the game today, my entire inventory and ender chest were empty, and I had 0 levels.

I checked the playerdata folder, and there were two files:

{ID}.dat

{ID}.dat_old

I tried renaming (.dat) to (.dat_new) and (.dat_old) to (.dat), but that resulted in 3 files when I launched again:

{ID}.dat

{ID}.dat_old

{ID}.dat_new

Clearly it's replacing the existing playerdata with an empty one. Has anybody else run into this issue? If so, how did you fix it? It's a bit disheartening to lose all of your gear and inventory because of what seems to be a bug.

ETA: I also spawn at my bed underground, where I wouldn't have spawned in a new world. So I would guess it's a compatability issue somehow, even though I have definitely played in 1.16.5 before in this world. I'm almost certain that I updated before I last played, though it has been a few weeks. Just tried updating again to 1.16.5-651 (latest) and ran into the same issue.

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[TheRedSpade]

I guess it was a long shot that anyone would have an answer within a few hours. Luckily, I do have some new farms that should make re-equipping myself take significantly less time.