Tor does not warn if obfs4proxy absent?

I’ve been running a bridge node on a Debian 11 server which I’ve moved to another provider running Ubuntu 22.04. It seemed OK in the logs, but a few days later I checked the stats, and they didn’t look good (connections being made but zero traffic).

Looking at /etc/tor/torrc I realised I’d not installed the obfs4proxy Ubuntu package. I’ve now done that so with luck it’ll all come back OK.

Should Tor not warn you if it can’t find obfs4proxy when it reads torrc? I’m guessing it can’t be a dependency of the .deb.