My second account randomly teleporting up in the air randomly for 1 frame in creative in lan multiplayer on integrated server. No addons. No mods. This happened to me in 1.20.80 and 1.21.60. I didn’t find anything online about this. This might be rendering issue or render optimization issue to be more specific.
It’s very hard to reproduce this, but first you need to put second account far away (maybe behind something) so it needs to be far left from your PoV. Try flying around until you see it
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The player is teleporting ~30 blocks up. There is no command blocks that may teleport the player up, same as teleporting down. That bug happened to me in older maps that I made. Also there is no movement on my client side second account.
Thank you for your report!
However, this issue has been temporarily closed as Awaiting Response.
Is this still an issue in the latest version? If yes, could you please add it to the affected versions (or mention it if you are not the reporter)?
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How far away is the second player from the platform where they appear? Are any of the command blocks running teleport commands?