RH8 - extract sub-curve issue

Hi, i have a issue with “extract sub-curve” see gif below.
If i have simple rectangle with one - three round corners, that is not possible to subselect just one straight line…
In RH7 works fine, subselect with “shift+ctrl” works too…
extract_curve

Hello - I see that, thanks.
RH-79445 ExtractSubCrv - stops at polylines

-Pascal