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I haven't seen this. I'm not applying a limit and I can scroll down forever. Try checking the console for anything that looks relevant, or see what the last search result looks like in the network log, depending on the browser it would look something like "illust?p=34&tag=&mode=all".
The only edge case where it can sometimes stop prematurely that I know of is if a page comes back completely empty, even though there are more pages. I've had that happen to bookmarks when I had a lot of bookmarks in a row from one user and the user deleted all of his posts, and they show up as "dead" bookmarks. But if you're seeing it at the same page in search results then it's probably something else.
I follow many accounts and have the same issue the guy under me has where I can't see any posts since there's a 34 page limit on how far you can scroll down. Please up the limit if possible.