I had a bookmark which suddenly had "no results" despite having hundreds of results the previous day. It turns out that it's a "bug" with the "page" parameter. It displays "No results found" if the "page" parameter is more than the total amount of pages. It should redirect to the last page similar to how this works: https://musicbrainz.org/edit/subscribed?page=100000

For example:
https://musicbrainz.org/search?query=format%3A%22Cassette%22&type=release&limit=25&method=advanced&page=1186

This currently works, but if you change it to "page=1187" it returns "no results found".
https://musicbrainz.org/search?query=format%3A%22Cassette%22&type=release&limit=25&method=advanced&page=1187