While gnucash includes an appdata file, it appears that is being rejected and not included in fedora repo metadata. Users are reporting it's not available from gnome-software/PackageKit, and I just confirmed using appstreamcli search gnucash got one indirect result for skrooge application, and nothing for gnucash itself. This may offer a clue: https://dl.fedoraproject.org/pub/alt/screenshots/f29/failed.html mentions: Vetos Has no Icon not sure why exactly, gnucash does indeed include an application icons named: gnucash-icon.png.
Looks like gnucash appdata file includes an invalid reference to the desktop file, so it fails to find any information that the desktop file provides (icon etc).
Upstream PR: https://github.com/Gnucash/gnucash/pull/440
gnucash-2.6.21-3.el7 has been submitted as an update to Fedora EPEL 7. https://bodhi.fedoraproject.org/updates/FEDORA-EPEL-2018-86f0abc677
gnucash-3.3-2.fc28 has been submitted as an update to Fedora 28. https://bodhi.fedoraproject.org/updates/FEDORA-2018-f43a91a7e8
gnucash-3.3-2.fc29 has been submitted as an update to Fedora 29. https://bodhi.fedoraproject.org/updates/FEDORA-2018-40a0ed580c
Thanks for taking care of this!
gnucash-3.3-2.fc29 has been pushed to the Fedora 29 testing repository. If problems still persist, please make note of it in this bug report. See https://fedoraproject.org/wiki/QA:Updates_Testing for instructions on how to install test updates. You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2018-40a0ed580c
gnucash-3.3-2.fc28 has been pushed to the Fedora 28 testing repository. If problems still persist, please make note of it in this bug report. See https://fedoraproject.org/wiki/QA:Updates_Testing for instructions on how to install test updates. You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2018-f43a91a7e8
gnucash-2.6.21-3.el7 has been pushed to the Fedora EPEL 7 testing repository. If problems still persist, please make note of it in this bug report. See https://fedoraproject.org/wiki/QA:Updates_Testing for instructions on how to install test updates. You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-EPEL-2018-86f0abc677
gnucash-3.3-2.fc29 has been pushed to the Fedora 29 stable repository. If problems still persist, please make note of it in this bug report.
gnucash-2.6.21-3.el7 has been pushed to the Fedora EPEL 7 stable repository. If problems still persist, please make note of it in this bug report.