BTW, when using the octave 5.1 copr repository on Fedora 30 I get:
# dnf upgrade ... Upgrading: qrupdate x86_64 1.1.2-17.fc31 group_scitech-octave5.1 79 k qrupdate-devel x86_64 1.1.2-17.fc31 group_scitech-octave5.1 8.0 k
The weird part is the .fc31 suffix. Was that of a bad timing when branching? :-)
Regards,