https://playground.babylonjs.com/#XCPP9Y#16
Open the gui editor and adjust the link offset value, then the text button in the 3d scene will fail to follow the object
Hello, I’ll investigate
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After investigating, this is caused by the current method of connection between the Playground and the GUI Editor, we’ll rework it for the next Editor release.
Got it 
Just leaving an update here, but the rework is (finally) merged, and it’s possible to edit controls linked to a mesh now 
Rework Scene and GUI Editor connection by carolhmj · Pull Request #13353 · BabylonJS/Babylon.js (github.com) (but since their position will depend on the mesh, editing them on the editor won’t have an effect)
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very nice