Thank you, @Seychellian.
Getting a file really streamlines the logging of these issue.
We posted this last last year: Rhino WIP Feature: Clipboard Enhancements
As far as can tell, it was never tested with AutoCAD for Mac or Mac Rhino. So this is good. It was easy to reproduce here. As a result of this we logged:
RH-96267/Clipboard-Copy-Paste-Rhino-to-AutoCAD-Not-Working
RH-96266/Clipboard-Copy-Paste-AutoCAD-Rhino-Not-Working
We will let you know here when there is a fix to test.
Sincerely,
Mary Ann Fugier