Show toolbar - no icons?

In V7, in the toolbar context menu, we get this:
In the V8 version we get this:

1.) The icons as seen in V7 are missing.
2.) When the dialog (?) comes up, it is large, then it gets sized, and this is visible.
3.) The dialog seems to be a sub menu (?), but its parents do vanish.
4.) This dialog/sub menu has rounded corners. Up to now this is the only one, all others have sharp corners.

Thanks @Charles for reporting, I’ve added RH-74600 Show toolbars dialog appearance tune-ups