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I think the basic fix should just remove RemainAfterExit=yes from the unit. It would then check condition of in unbound-keygen.service and run only if files mentioned by condition are missing. It can cause very small delay, but compared to already present action in unbound-anchor it would be very minimal.

Fixed already in Fedora. Seems just removal of RemainAfterExit=yes from unbound-keygen.service is all required.

https://src.fedoraproject.org/rpms/unbound/pull-request/8

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory (Moderate: unbound security, bug fix, and enhancement update), and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHSA-2022:7622