It looks like it’s searching for pattern matched blocked stuff, if it’s blocked on both the overflow url and the normal url, then the filter list is blocking the element. But it’s only a guess,

These urls were all blocked by my hosts file, so it seems to trigger something else.

Edit: it didn’t do anything it seems, it’s all “not detected”.

I use ublock origin with no global cosmetic filtering, only some specific cosmetic filtering that I added manually, nextdns with a shit ton of block lists, a hosts file with hagezi ultimate mini.

It didn’t detect anything:

Edit: I’m using the adguard blocklist

Edit 2:

The website does only some downloads that are pattern matched only by some block lists, if you don’t use certain rules, it doesn’t get caught. It doesn’t use other domains, or any other thing, just downloads files that look like domains or parts of the URL of the pattern matched rules.

So if the filter list use domain blocking, it won’t get caught by the website. If the filter list use simple URL pattern matching to get the domain or part of the path, then it will get blocked.