Spanish language detection not working

I just ran into a tiny issue I hadn't seen before, a release clearly having Ita Eng Spa in the title is detected as Multi Language Italian and English. Spanish is not recognized.
For the same movie, a release tagged as Ukr/Spa is detected as Ukrainian only.

Is this a known bug or is radarr expecting it to be tagged as Esp(anol) or something, despite all groups naming it Spa(nish)?