SOLVED: Specific subdirectory not being picked up on scan

[ram]

I have a large archive of Audio Dramas I'm scanning as a Books library, but I'm finding some issues with actually scanning for the files.

The Library is at E:\Whovian Audio Dramas, and within it is the folder Big Finish - Doctor Who. Most of the files and folders were scanned for fine, but E:\Whovian Audio Dramas\Big Finish - Doctor Who\1. The Classic Series\4. The Third Doctor Adventures (3DA)\'s files are generally not being put into my Jellyfin library.

I say "generally", because there's one exception. The file E:\Whovian Audio Dramas\Big Finish - Doctor Who\1. The Classic Series\4. The Third Doctor Adventures (3DA)\3DA 13.01 - Revolution in Space.mp3 is being included in the library, but in the parent, 1. The Classic Series, folder.

I've checked through the MediaInfo of various files in these folders to see if there was any difference that would make Jellyfin skip these files and not others (format, codec, etc) but can't find any. Help?

To offer an overabundance of information, here's the directory tree for the Library: https://pastebin.com/bf4r39pU
Here's the tree as it's displayed in Jellyfin: https://pastebin.com/n6SAYTPa

Here's the MediaInfo for a file that doesn't work: https://pastebin.com/N3QM0h58
And for comparison the MediaInfo for one that does: https://pastebin.com/css3HZdv

My metadata settings are:

Code:

Metadata readers:
Epub Metadata
Open Packaging Format
Comic Provider

Metadata downloaders (Books):
[all unchecked]

Automatically refresh metadata from the internet: Never

Image fetchers (Books):
Epub Metadata
Comic Book Zip Archive Cover Extractor

I've tried making the directory tree shallower, but to no avail. Any ideas?
I've tried making the directory tree more shallow, but to no avail.

[TheDreadPirate]

You need to put '3DA 13.01 - Revolution in Space.mp3' into its own folder.  Because that file is the only one not in a folder, Jellyfin stops scanning any sub-folders (not sure if this is the intended behavior or a bug).

I created a folder "13. Revolution in Space" and moved that file into it.  After rescanning it picked up all the other folders.