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Jellyfin fails to create new music genres from system files - Printable Version

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Jellyfin fails to create new music genres from system files - Jouldi - 2024-08-07

Hi everyone,

I am a new user of Jellyfin and a bit of a tech illiterate guy... I'm currently running Jellyfin through True Nas Scale on an old laptop. 
Everything is working perfectly fine except a detail that has its importance to me. I could not find any information nor documentation on this so here I am. 

I want to create an harmonized musical library on my own which means no plugins. I find Music Brainz and all to use too much folksonomy, bad tags and irrelevant genre classification. 
I've made my own Thesaurus for it and shit. Anyway, thing is I want Jellyfin to fetch the musical genre in the system file metadatas (which I've enabled the option for) for it to create an entry of that genre in the "Genres" section every time a new genre appears. I would also like it to regroup every albums/songs that has the same genre tag under their common genre entry. 
It has worked partially but it seems for unexplicable reason that Jellyfin fails to do it for certain files.
As an example (see screen captures) :
This album has the genres I attributed to it but Jellyfin won't create a "Pop" genre nor will this album appear in "Rock" and "Alternative Rock". On the other hand Jellyfin has created a "Jazz Rock" genre just for this specific album...
Is there something I missed or a way to fix that ? 
If you have encountered a similar issue or found a better way to handle this, I'm always up for experience sharing. 

Many thanks in advance !