I did not see that. I'll update that now.

Hi Peter, here is SG support's reply. So everything looks good to go. Much appreciated!

I logged into the backend of the website lmbo.org and pressed the clean cache button.

After that I sent the same curl request my colleague provided towards the .woff2 file and its x-proxy-cache header was set to MISS immediately after I purged the cache:

Antonia-Nikolova:~ antonia.nikolova$ curl -sILX GET lmbo.org/media/vendor/fontawesome-free/w.../fa-brands-400.woff2

HTTP/2 200
server: nginx
expires: Tue, 11 Apr 2023 16:56:44 GMT
x-proxy-cache: MISS

Then I sent it again and the x-proxy-cache header was set to HIT:

Antonia-Nikolova:~ antonia.nikolova$ curl -sILX GET lmbo.org/media/vendor/fontawesome-free/w.../fa-brands-400.woff2

HTTP/2 200
x-proxy-cache: HIT
accept-ranges: bytes

Note that I have shortened the output of the above command in order to provide you with the relevant bits of information only.

Based upon the above tests, the plugin is cleaning the cache on the website properly.