Certificate problems with multiple pages to the same repo

I point many different web addresses at the same gitlab repo (about.summerhays.net and blank.summerhays.net for instance), but there seems to be a bug in how the certificate is being created. Now I get certificate warnings for all but one of them. But this is a new bug, as I've been doing this on Gitlab for years.

Here's the error: The certificate is only valid for about.summerhays.net.

Error code: SSL_ERROR_BAD_CERT_DOMAIN

PS maybe the same bug reported here

Tag: pages, LetsEncrypt