Record Detail - Canvas View - Grouped Mirror Fields Don't Populate

Record Detail - Canvas View - Grouped Mirror Fields Don't Populate

Hello,

I could have sworn this used to work, so I'm not sure when it stopped, but I have a canvas view on my Account record detail page and I have a lookup field with its 3 mirror fields on said page. If I just put the fields separately, they render fine. If I try grouping them, they show up as empty (*except the lookup field itself). 

Other grouped fields with lookup values, not involving mirror fields, seem to render fine.

Also, while on the subject, Grouping fields used to let you Ungroup the fields, but now you may only delete them. I would appreciate it if the Ungroup option returned.

Thank you!