Clipping not showing for Fujifilm Classic Neg. profile

In Lightroom, with other profiles I can turn on clipping (J) and see red / blue areas where clipping is happening.  This does not show for Fujifilm Classic Neg. profile.  Also with other profiles, I can hold Alt whilst moving the White or Black sliders and see where clipping is happening.  The histogram and "Auto" adjustment of the sliders seems to be OK - it's just the clipping which isn't shown, and as far as I have noticed, only for Classic Neg.  I'm using raw (RAF) files from an X-T4 and shooting with Classic Neg as the simulation in camera.

As a workaround I can change to another profile such as Provia/STD and do adjustments there before switching back to Classic Neg, but it's a bit of a faff, do a better solution would be appreciated.  

Thanks.