When entering a boat when sitting in another boat while the server is lagging, it is possible that a client-server-desync occurs, where the client is outside of the boat while the server still considers the player to be inside of it.
To reproduce
Place a lot of boats in the same place (e.g. activate a repeating command block with the command
summon boat ~ ~0.5 ~
for a second)Cause server lag, e.g. by setting
/gamerule randomTickSpeed
to a high number (mspt should be above 50)Right-click the boats repeatedly until you are no longer able to enter them
→ ❌ DesyncWalk away
Try to place a block
→ It disappearsPress shift
→ You're teleported back to the boats
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I don't understand what your issue is. Please provide a video.

may be related to MC-191714

Yeah it seems to be the same issue
im too lazy to record a video, pls forgive me