When you log out your player dosen't save.

This is on the server version of 1.16 Pre-release 2.

The server had been working fine but just now I finished mining and came up and deposoted all my ores and blocks and put stuff in the furnase. I logged out and came back and my player was back in the mines with the invertory back to how it was before i went mining, I went back to my house and all the ores I mined were in the chest. All I can really say is the player data is not saving, Me and my brother were able to recreate this by logging out and back in moving us back to where we started a few hours before.