Bug: Mouse button control "taskbaritem|ctrl+rclick" seems to stick when clicking a group.

I'd like to set things up so that right-clicking an item opens the jump menu, and ctrl+right clicking opens the standard menu. However, if I set the following Mouse Button Control to achieve that: "taskbaritem|ctrl+rclick -> 6", if I ctrl+right click a combined group something "sticks". Any menu item I right click (while NOT holding ctrl) from then on opens the standard menu instead of the jump menu. Deleting the mouse button control fixes it, and possibly clicking around for an unspecified amount of time (though I haven't been able to figure out a reproducible way to do that; it seems almost random).
I tried setting up both
"taskbaritem|shift+rclick -> 6"
"taskbaritem|rclick -> 5"
but that did not work.

It's strange that setting "taskbaritem|shift+rclick -> 6" seems to work just fine, so I'm using that as a workaround.