So I found this bug where you can place scaffold mid air if you click fast enough. So can it be fixed? And my friend's pov is one of the photos so you guys can see how other players see it.
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Can confirm on vanilla 1.16.4.
Hey there!
This report is actually invalid as your game is modified. In the environment field of this ticket, you mentioned that the issue occurred whilst playing with Optifine. This modification is not supported by Mojang and the bug tracker only handles issues relating with Vanilla Minecraft, (unmodified game versions). If the issue persists without the use of mods, feel free to make another report.

This is because the player's own movement is calculated by the client, while the server is only responsible for checking and moving entities.

Actually a duplicate of MC-148795