Rhythmbox doesn't import parts of downloaded albums
I've noticed Rhythmbox sporadically importing only part of albums recently. Two examples are attached.
The formats are standard (FLAC and V0 MP3 in this case). You can see some of the (I think) correctly omitted .nfo files, but it's not clear to me why Rhythmbox would/could determine source type for part of an album but not the rest of it. The error messages reads: "Could not determine type of stream."
Is there a reason and/or remedy for this?