libappindicator-gtk3 has been removed from RHEL/CentOS since RHEL9/CentOS Stream 9 and is blocking el9 branch of some tools like transmission.
Please branch and build libappindicator-gtk3 in epel9.
FEDORA-EPEL-2022-b6ebb75b45 has been submitted as an update to Fedora EPEL 9. https://bodhi.fedoraproject.org/updates/FEDORA-EPEL-2022-b6ebb75b45
FEDORA-EPEL-2022-b6ebb75b45 has been pushed to the Fedora EPEL 9 stable repository.
If problem still persists, please make note of it in this bug report.