If the update to Core Update 186 is carried out after 9th July 2024 then the corrected openvpn-crl-updater script was merged into the update. I have tested that and confirmed that it is working.
The fix is also in Core Update 187 which is currently released for Testing. The plan is to be able to release the full version by end of July so that release will then update your openvpn-crl-updater script to the correct one.
More details are in some posts in the main thread on this issue.
https://community.ipfire.org/t/log-summary-openvpn-no-crl-update/11816
https://community.ipfire.org/t/log-summary-openvpn-no-crl-update/11816/7
https://community.ipfire.org/t/log-summary-openvpn-no-crl-update/11816/11
Additionally restoring as backup no longer has the risk of providing an expired CRL as since Core Update 172 the openvpn-crl-updater script is run after every restore that you do ensuring that your restored certs have a fully updated CRL.