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MC-147922

Player duplication in LAN worlds

When my friend joined my server (to be exact lan server if it matters), on chat I saw duplicated info that she joined (screen). I thought that it's just minor bug with displaying info about joining the server. Few minutes later, when I was searching something in save files I saw that server had 3 playerdata files. I was confused because nobody except us known ip server. Later she saw that on players list there are two players with her nick, but one with steve skin. I tried to teleport to her and it teleported me to her clone(it stayed on spawn). I tried to kill it and it was kinda weird. It worked like a voodoo doll. Then she left and I kicked the clone.

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I asked also my friend to send me her log and there are 750k lines of pure errors...

[media]

i encountered and reported this but it was a duplicate and it told me to add extra information here so here is my log file and some images and some more details (because more info is better right?):

we were playing lan multiplayer like we do often. then i got lag so i logged out to log back in because that usually helps against lag. when i tried to log back in it timed out, but it does that more often so i tried again and then it worked. HOWEVER, when i joined multiple weird things were going on:
1: i spawned in at the spawnpoint of the world instead of where i logged of
2: my skin didn't render, i was just alex. i did however have the items i had when logging of.
3: a second alex spawned with my player name (MinerBat) it reacted to the same input as the one i was (so if i pressed W we both moved forward, S both backwards etc.) with a little bit of delay.
4: the other players saw 2 alexes moving both with MinerBat as their name
5: the tab screen showed 2 MinerBats with alex face
6: at the location i logged out in at the start there was a 3rd player.
7: the 3rd player had my skin but only the bottom layer was rendered (you can have 2 skin layers). but had no name above his head and didnt show in tab menu. (i should have looked if he had a hitbox but i didn't think about checking that at the time)
8: it said MinerBat joined the game twice in chat

after a few minutes i relogged again trying to fix it. this is what happened then:
1: i went back to my old logout location and got my skin back normally
2: one of the alexes disappeared (presumably the one i was controlling directly but is no way to know for certain) but the other one stayed in the world and on the tab screen
3: this alex didnt do anything anymore except for floating
4: using /tp MinerBat 0 100 0 affected the alex but not myself
5: using /gamemode survival MinerBat put me in survival normally, the alex was still floating in the air but could take damage
6: restarting the lan world entirely (having the host account log off and on and creating a new lan world) made everything normal again

Is still issue still reproducable for anyone past 1.16.5? Given the lack of steps to reproduce, I was unable to replicate the same behavior when trying to myself.

I dont know, i havent seen it recently but i dont play LAN nearly as much as i used to anymore. i used to have it happen randomly multiple times back then but there didnt seem to be any specific way to trigger it so i dont know any steps to reproduce

Mikołaj Miłoś

(Unassigned)

Community Consensus

(Unassigned)

Minecraft 1.14 Pre-Release 1, 1.16 Release Candidate 1, 1.16.4, 1.16.5

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