The output in
https://koji.fedoraproject.org/koji/buildinfo?buildID=1449701
seems to indicate that cppad-devel-20200000.0-2.fc31 built successfully.
When I execute
dnf info cppad-devel
in f31 I only get the old version, to be specific:
Name : cppad-devel
Version : 20190200.4
Release : 1.fc31
Architecture : i686
Size : 369 k
Source : cppad-20190200.4-1.fc31.src.rpm
... snip ...