React: issue when dragging between 2 grids demo

[moonsky-all]

Subject of the issue

https://gridstackjs.com/demo/react-hooks-controlled-multiple.html

Your environment

• gridstack.js 10.1.2
• MacOS 14.5, Chrome126

Steps to reproduce

https://gridstackjs.com/demo/react-hooks-controlled-multiple.html

https://github.com/user-attachments/assets/8a1b9eea-6cec-4963-9759-ad7c750ef644

The video can also be visually displayed. When entering the page and making some adjustments (stacking any two nodes together), then dragging a node from another group according to the video display path and inserting it from bottom to top, the node disappears and an error is reported in the browser console, causing some nodes to be unavailable

I have re recorded another video

[adumesny]

please convert this to english.

[adumesny]

I don't use React so the issue could very well be in the React demo code...