Original Audio not exporting?

Hello, I’m not sure if this is a bug or it’s just how the app works, but I noticed that when I review the items in Anki, SOME shows/media cards contain the original audio. But not all shows/media cards export with the original audio. My example is Solo Leveling and My Hero Academia (both on Netflix). Solo leveling has the original anime’s audio in the Anki card, but MH has a machine-generated voice for the card. Is this intentional, a bug, or a setting that I’m missing?

If this isn’t already planned to be consistent (using the original audio), I think it would be a great motivator for me, as hearing the intensity or vibe of the original audio is great.