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For the permissions issue you may want to open a Github ticket in opnsense/plugins

Attaching it to existing ticket : Link ...

Works fine for me with the default OPNsense theme, in Certificates and Authorities sections.

Have you tried a different browser ?

Yes @newsense, I did and the result is the same. But if it was a browser issue, all certificates would be affected, not just the last generated ones.
Am I right?

Update : It might be a permissions issue. In /var/etc/acme-client/certs I found that the last acme certificates are created with different permissions compared to the older ones. The older certificates folders have drwxr-x---, but the last ones drwx------ and the keys inside: from -rwxr-x--- to -rw-------.

For me it`s the same. Is there any progress on this, or workaround may be?