Adding a blank space " " in library search will return a list of incorrect files, pulled from various locations on the computer, including outside of the designated library folders. In my case, Winamp is only set to watch D:/Music but a blank space search returns audio files from my Windows User Desktop & Downloads.
In addition, some library files are displaying broken or missing metadata, but only when returned via a blank space search. If I search those same audio tracks normally, eg. "artist name" in search, then the metadata appears correctly in the library.
Sorry I can't provide a good screenshot of this one, but the results in my Desktop and Downloads are private. It's an easy repro to try yourself tho.
Repro steps:
1. Go to library
2. In the search box, type a blank space with spacebar
3. Observe library results from incorrect locations and broken metadata
The attached screenshot does show a blank space search (obviously invisible) returning 52 tracks missing Genre and 43 tracks missing Artist, but under normal searches and at a default no search state, no item in my library is missing these data. I'm not yet sure what is determining which files appear broken under a blank space search.