Portuguese BR subtitles listing English Subtitles

[Dalmo-Guedes]

Server Version#:1.41.3.9314
Player Version#:10.25.0.2403
I am trying to find subtitles for Luther S01E01 in Portuguese BR and it shows English Subtitles instead. I acesses OpenSubtitles and there are Portuguese BR subs for this episode. Can someone tell me how can I fix that?
And it is happening for movies too. It seems that the Portuguese BR selection is being identified as English.

[OttoKerner]

Plex doesn't find Portuguese subtitles anymore, just english results instead

Since a few days ago, every search for portuguese subtitles always returns english language subtitles - either European ou Brazilian variants. Before that, when there were no portuguese subtitles available, I’d get an empty list. Now I get a list of english language files. If I look for french, italian or polish files, I get the list of files in the correct language. I think this may be related to some API change at opensubtitles.org. Could anyone please look into this? Thank you