I tried to post a Google form for an IC, and the random url Google gave me happened to contain the word '****'. The filter decided to censor the url replacing part of it with stars so anyone clicking on it got a 404 error. I'm pretty sure the filter should only censor visible text, not links, so this is a bug.
For reference here's the
link. Click on it with censorship turned off, it works. With censorship turned on (or when logged out in incognito mode) you get a 404.
Google has since given me a new url so it's not urgent for me.