Unfilled template available at any "/printer/<ANY-STRING-HERE>" URL

When I go to

http://localhost:631/printers/ANY-STRING-HERE

I get this, which does not seem like it should be available at a URL:

It seems like an HTML template that doesn't have a data. In my experience, requesting this URL should return a 404.

% uname -a
Linux m 5.18.5-arch1-1 #1 SMP PREEMPT_DYNAMIC Thu, 16 Jun 2022 20:40:45 +0000 x86_64 GNU/Linux
% yay -Qi cups | grep ersion
Version         : 1:2.4.2-3