@ivory following up on this in case it slipped through. I remember it from back in tweetbot. not sure if it's technically not easy to do. one workaround i found is using the normal search tab with `from:<user> <search_word>` and adding filters there as necessary.
@fahadbuilds Yes that is because filtering doesn't actually search. It just filters what is already loaded. The user you happen to be trying to filter with "no replies" probably mostly replies to people (at least from what was loaded) and so nothing is left to display.
@ivory yeah that user was actually you ( @ivory ) . i'm guessing one thing you can do is something like if no posts found, or use scrolls down, then search for more results that match the filter. but it might be easier said than done.