Jellyfin struggling with non-standard extra features

[King Mustard]

For my example, The Big Bang Theory currently has six extras on TheTVDB.

I have two of them (S00E05 and S00E06) but I also have lots of extra features from the DVDs that are not on TheTVDB.

For example, I have:

The Big Bang Theory S00E00 S01 Gag Reel.mkv
The Big Bang Theory S00E00 S02 Physicist to the Stars.mkv
The Big Bang Theory S00E00 S03 Take-out With the Cast.mkv
#The Big Bang Theory S00E00 S04 The Big Bang Theory Theme Song.mkv
The Big Bang Theory S00E05 Comic-Con 2016 Writers Panel.mkv
The Big Bang Theory S00E06 A Big Bang Farewell.mkv

Jellyfin shows S00E05 and S00E06 correctly:

   

However, for the others, it just duplicates what it thinks is S00E01 ('Unaired Pilot') from TheTVDB:

   

This is happening for all my TV shows.

Any ideas?

[theguymadmax]

Specials should be placed in the Specials/Season 00 folder if they have a corresponding match in the metadata provider.

All other specials should be placed in an Extras folder.