We have had some pages drop off our site. The status and permissions are all ok for the assets, and the assets have not really been modified in any way lately.
Whatever it was, it seems to have been sorted now - the link in your post has started working.
One interesting thing I did notice was that when it wasn’t working, the server was identifying itself as “Apache” and adding a slash to all URLs via a HTTP 301 redirect, whereas now it is working and identifying itself as “openresty”, and isn’t adding those slashes.
Were you transitioning from one server (Apache) to another (Openresty) by any chance?
Thanks very much for pointing out, initially thought it was a matrix issue, but it was an apache config issue, a malformed regular expression that determines if traffic goes to new site or the old site, our unix team were able to resolve.