ok… here’s a similar bug report, where they did add (or at least said they would add) some sort of message like what you proposed: https://forum.inaturalist.org/t/cannot-fetch-pages-beyond-333/3861.
in this particular page, i don’t think there are parameters / filters. so maybe it’s better to throw up a message saying that the page can’t show records beyond X rather than giving you the fail whale (shark).