During D&D, a cache is created in which it is stored whether the dragged element can be dropped at the position or not.

This is accessed incorrectly so that the server is repeatedly asked whether the element can be dropped at the position.

If the D&D is performed with the Edge, this causes the cursor to flicker.

Test

Without the fix, when hovering over the editing table in "Technical demo > Components > Drag & Drop on", the selection flickers with every mouse movement.