[MC-92437] "Player moved wrongly!" in Game Output when eating chorus fruit

The reason why this happens is very likely that the last position of the player is not updated when the player position is changed. More concrete, the server first receives packets and after that updates the player and updates its last position (method net.minecraft.network.NetHandlerPlayServer.captureCurrentPosition()):

Line numbers (MCP 9.30)

Packets:
IntegratedServer 176
MinecraftServer 691
MinecraftServer 744

Update:
"
"
MinecraftServer 801

The problem is that the method net.minecraft.network.NetHandlerPlayServer.setPlayerLocation(double, double, double, float, float, Set<EnumFlags>) which is used when the player used the chorus fruit (Update part) does not update the last player position (captureCurrentPosition()). When the client then sends the new position back, the server thinks the player teleported, because the last position was not changed in between.

Possible fix

public void setPlayerLocation(double x, double y, double z, float yaw, float pitch, Set<SPacketPlayerPosLook.EnumFlags> relativeSet)
{
    double d0 = relativeSet.contains(SPacketPlayerPosLook.EnumFlags.X) ? this.playerEntity.posX : 0.0D;
    double d1 = relativeSet.contains(SPacketPlayerPosLook.EnumFlags.Y) ? this.playerEntity.posY : 0.0D;
    double d2 = relativeSet.contains(SPacketPlayerPosLook.EnumFlags.Z) ? this.playerEntity.posZ : 0.0D;
    this.targetPos = new Vec3d(x + d0, y + d1, z + d2);
    float f = yaw;
    float f1 = pitch;

    if (relativeSet.contains(SPacketPlayerPosLook.EnumFlags.Y_ROT))
    {
        f = yaw + this.playerEntity.rotationYaw;
    }

    if (relativeSet.contains(SPacketPlayerPosLook.EnumFlags.X_ROT))
    {
        f1 = pitch + this.playerEntity.rotationPitch;
    }

    if (++this.teleportId == Integer.MAX_VALUE)
    {
        this.teleportId = 0;
    }

    this.lastPositionUpdate = this.networkTickCount;
    this.playerEntity.setPositionAndRotation(this.targetPos.xCoord, this.targetPos.yCoord, this.targetPos.zCoord, f, f1);
    // Added this to update the last player position
    this.captureCurrentPosition();
    this.playerEntity.connection.sendPacket(new SPacketPlayerPosLook(x, y, z, yaw, pitch, relativeSet, this.teleportId));
}