This has still not been fixed. The server is sending an out-of-date intermediate certificate. Please retry the SSL analyser mentioned above.

It is true that Chrome on macOS is not showing any problems. There are no problems with the system openssl and curl on macOS. This is because they use
Apple's certificates in the Keychain.

However, using the curl certificate bundle and curl and openssl installed by Macports shows the problem.

Also FreeBSD 13 with the curl and openssl provided by the pkg install shows the problem.

Fossil running on FreeBSD 13 complains about the certificate