Recently I decided that I wanted to make my singleplayer 1.16.4 world multiplayer so I went and copied the data from the world file to the server.It actually worked, I saw it was the same seed and everything but there was one issue I didnt have my items well basically it copied everything except my player data even though I had copied that with the world file so I didn't have access to my cats and my inventory items so I tried different methods like using the /data command to untame my cats so I could tame the back but it didn't work. Also i didn't change my in game name so there is no possibility for that
Recently I decided that I wanted to make my singleplayer 1.16.4 world multiplayer so I went and copied the data from the world file to the server.It actually worked, I saw it was the same seed and everything but there was one issue I didnt have my items well basically it copied everything except my player data even though I had copied that with the world file so I didn't have access to my cats and my inventory items so I tried different methods like using the /data command to untame my cats so I could tame the back but it didn't work. Also i didn't change my in game name so there is no possibility for that