A quick review of /var/lib/acme-chief/certs/wikibase shows that the staging_time setting has been ignored:
drwxr-x--- 2 acme-chief acme-chief 4.0K May 27 14:00 62aba44ab023477aa136b38ada6dc4f1 lrwxrwxrwx 1 acme-chief acme-chief 32 May 27 14:00 live -> 62aba44ab023477aa136b38ada6dc4f1 lrwxrwxrwx 1 acme-chief acme-chief 32 May 27 14:00 new -> 62aba44ab023477aa136b38ada6dc4f1
note that ctime for new and live is exactly the same and the cert issue date matches the live symlink ctime:
root@acmechief1001:/var/lib/acme-chief/certs/wikibase# openssl x509 -noout -dates -in live/rsa-2048.crt notBefore=May 27 13:00:35 2019 GMT