Cannot select dimension leaders in assemblies

When doing an in-context edit for a part I am unable to select a sketch dimension by the leader like this:

But if I mouse over the actual number I can select it like this:

Lastly in the part environment I can select either one, even just the dimension leader like this:

With Instant 2D on, selecting the dimension by the number value in an assembly is painful!  Its better with instant 2D off, however, shouldn't it just be the same as the part environment for consistency sake?  Does it behave like this for everyone or is this a just me thing?  We are running SW 2017 SP2, and PDM Pro 2017 SP2.  Thanks for the help!