Superclip issues with mixed stereo & mono tracks

If I create a superclip from a selection of stereo and mono clips, the mono clips are dispatched to the “centre” channel instead of L&R. This means they are not audible or visible in the superclip. I’m working in a stereo montage in WL8.5.20

“…the mono clips are dispatched to the “centre” channel instead of L&R.”

That’s only if your working in a surround channel configuration. If you were working with a stereo montage there would be no option for a centre channel. Have you tried running a stereo configuration that allows mono/stereo channels?