BUG: Zoom Selected does not work with selected clipping planes

I select a clippingplane, and middle mouse click, which should trigger:

Command: ZS
Command: '_Zoom
Drag a window to zoom ( All Dynamic Extents Factor In Out Selected Target 1To1 ): _Selected

Instead I get:
Command: ZS
Command: '_Zoom
Drag a window to zoom ( All Dynamic Extents Factor In Out Selected Target 1To1 ): _Selected
Unable to zoom - no objects are selected.

Thx,

G