Fix grid nodes being corrupted under specific circumstances (spatial …

…anchor + adjacent QNB)

src/main/java/appeng/me/GridNode.java

@@ -188,6 +188,10 @@ void validateGrid() {
     public Grid getInternalGrid() {
         if (this.myGrid == null) {
             Grid.create(this);
+            // Note that the node can be moved immediately to a new grid when
+            // it triggers adjacent connections due to block updates emitted while it joins the grid.
+            // That means the return value of Grid.create is not necessarily the new grid,
+            // but myGrid will already have been updated by the Grid calling setGrid on this node.
             return Objects.requireNonNull(this.myGrid);
         }