thats fixed for the next update
Yup, that's fixed! Sorry I forgot to confirm sooner.
I can't swear to it, but I think it's been since this fix that there's a new bug. It's definitely recent, as this was working okay previously.
1) Type a search in the search box
2) Return to Music (or other) node without clearing results
3) Use middle-click to do another search
The Search Results node doesn't do a new search, it just applies the filter to the existing search, as shown here: