SSL Cert Expiry stopped working after HA 2022.9 upgrade

I’ve been using the Certificate Expiry integration on my HA (Core) host for a couple of years. It would show the number of days remaining before expiry in the “State” attribute. After upgrading to HA 2022.9 yesterday the State is now “. header.”.
I removed and re-added the Certificate Expiry integration but it still shows “. header.” as the State.
Any idea what’s happening? I’m using a LetsEncrypt certificate.