Boat Standing Fix

The fix targets the vanilla issue MC-156980, where a boat bobbing on water makes movement stutter and a player standing in it gets pushed around and stuck. Two server-side checks in the movement handling misfire while the boat drifts under the player: a tolerance check that rejects movement caused by the boat's own motion, and a collision check that reads the boat's shifting hitbox as a new collision. Both checks are relaxed only for a moving entity close to a boat, and every other movement validation keeps its normal strictness.

Movement is validated against the client's reported position: the client predicts where it is, and the server recomputes the same result and pulls the player back when the two differ too much. The mod changes only the boat-specific part of that comparison. It runs on the server, and a vanilla client gets the fix without installing anything once the server runs it. Singleplayer works because the integrated server handles it.

The mod is open source under the GNU General Public License v3.0 or later. Files are published for Fabric only, for 26.3 and the earlier builds 1.21.11, 26.1, 26.1.1 and 26.1.2 and 26.2. Source code and an issue tracker are available.