When I move the 3D button cluster from its default position (where it takes up 1 whole line just for itself, which seems a little wasteful of screen space) to the top of the screen, it displaces some of the standard button clusters, and they do not reposition themselves to their correct locations.
Also as can be seen fron the screenshot, the "Split view" button vanishes in the move, but can be restored by pressing the "Map view" button, which makes the "Split view" button reappear.