fix...

legacyver/legacypacket/interact.go

@@ -32,9 +32,13 @@ func (pk *Interact) Marshal(io protocol.IO) {
 	io.Varuint64(&pk.TargetEntityRuntimeID)
 	if proto.IsProtoGTE(io, proto.ID898) {
 		protocol.OptionalFunc(io, &pk.Position, io.Vec3)
-	} else {
+	} else if pk.ActionType == packet.InteractActionMouseOverEntity || pk.ActionType == packet.InteractActionLeaveVehicle {
 		pos, _ := pk.Position.Value()
 		io.Vec3(&pos)
-		pk.Position = protocol.Option(pos)
+		if pos != (mgl32.Vec3{}) {
+			pk.Position = protocol.Option(pos)
+		} else {
+			pk.Position = protocol.Optional[mgl32.Vec3]{}
+		}
 	}
 }