This is because we fixed an issue with the scene not catching up events
Now you can define if a control is a pointer blocker:
https://www.babylonjs-playground.com/#XCPP9Y#911
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Speeking of the pointer blocker, I notice that if parent and children both have isPointerBlocker set to true and a hoverCursor property, the GUI doesn’t manage to show the right cursor when blocks are hovered:
https://www.babylonjs-playground.com/#XCPP9Y#912
problem found and solved!
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Migration complete. Thanks a lot 
you rock!