Ambiguous selection indicator not working

My ambiguous selection indicator has partially stopped working.

It only displays the arrows for the first selected entity - but when you move the mouse down the selection menu no other entities are indicated.

However, if I use the scroll wheel on the mouse then the different entities are displayed as expected.

Rhino7, latest build. Also have the WIP installed.

Hi Rob - is the item highlighted in the menu when you move the mouse?

-Pascal

Yes, the item highlights when moving the mouse.