Can't join game

https://aternos.org/log/When i joined the game i could be in the game for like 10 seconds before i was suddenly disconnected
I was first playing on Snapshot 20w51a, and then switched to 1.16.4 papermc and i couldnt join anymore.
Could this image maybe help?

oh damn, that sucks, tysm for the info!
Other people wouldn't tell me. Thank you for replying quickly!

Wait what if i start a new world but download my current world and upload it to that world?
Could it be fixed this way?

ok this can be closed ty!