testing here with the latest daily build (9/13) - looks like “dancing materials” bug has been fixed indeed, but there is one more thing that misbehaves. When you either duplicate the layer or match layer properties, on the first click on the new layer material, the “make unique” yellow field doesn’t show up (which is when it is most needed). You have to close it and reopen to see the dialog. Recording below, for your reference.
Also, please see my post above with another bug in “Floating Editor”. Not sure if you can replicate that on your end but here it always jumps to wrong material.