Name duplicate in player list and internal issues

What did i do
I logged onto a dedicated server as the second player on the server.

What should happen

There are two players in the player list and commands like /gamemode a give me gamemode a

What happend instead
I appear to be two times in the player list, gamemode a triggers the "gamemode changed" message but i a) dont have hearts, b) can be killed tho c) see the creative invetory but cant get items out of it d) i can fly. Oh and my skin changes to steve.

Screenshots

I updated to 1.19.62 while writing this bug report and after trying to get more screenshots the bug seems to hide itsself. Server runs at: 1.19.62.01 witch the old spct experiment turned on.
If the 1.19.62 did indeed fix that bug i beg that a "client outdated" message is displayed as it can break minigames in such way where specific gamemodes cant be given correctly.