I don't know if this has already been reported, but I couldn't find it.
Using 2.44d, load a folder containing FLAC files with embedded album art. Select a file ( or all files for that matter ). The album art appears correctly. Remove the file(s) and the album art remains and stays displayed until another folder is loaded and a file selected.
This doesn't happen with 2.44, where the image disappears when the file(s) is removed. I think it started happening before 2.44d, but I'm not sure when exactly.