sometimes when you get disconnected while in match, when you rejoin you have the same hearts and hunger that you had before you got disconnected
also happens with /stop
Never happened to me before. If it still happens to you, try to disable player stats saving in paper.yml.
If it still happens to you after disable, it might be something wrong in your side.
sometimes when you get disconnected while in match, when you rejoin you have the same hearts and hunger that you had before you got disconnected also happens with /stop