The same thing happened to me.
I was riding a manta and left my computer for a while, hoping I would still be riding the manta when I came back. I had of course fallen to my death and the game had autosaved. I did not respawn at first. I left the game (because my husband and I are playing multiplayer, and if I stay in the game, he is unable to enter, unless I exit to desktop and then go back in, which is a whole other issue) and reentered, assuming he would be able to revive me when he got in the game.
When I got back in the game I had respawned in the Hub, with no inventory. We walked (oh God, how I miss my jet pack!!) to my death location and found my body, no box. We were both able to revive the body, but my inventory (including 4 hard drives) was lost.
The scope of our troubleshooting attempts is limited to my husband killing my new self, and then trying to revive the "old" body. No luck.