The game still not having pt-br subtitles available in the Nintendo Switch version, and the support still ignoring my replies.

Yeh, and before you ask, yes the Nintendo Switch have pt-br languague on the operational system, bellow are the steps do use them:

Go to settings -> System and:

First: on Language option select Português.

Then reboot the console, and go to settings -> System (in portuguese this option is called "Console" ) and:

Second: on Regions option select The Americas (in portuguese is just "Américas").

Them reboot the console again, and the Console is set to use Brazillian Portuguese.

Note 1: If in region option you select Europe, the console will use Portugal Portuguese (which is very different to Brazillian Portuguese) .

Note 2: The Brazillian Portuguese language was addded by Nintendo to the Nintendo Switch on update 11.0.0 (actually we are in 13.2.0);

Note 3: I downloaded an .nsp of Minecraft Dungeons on internet, to seek if the game has the dubbing and subtitles pt-br archives, well, i extracted the .nsp file, then i opened the .paks files whith UE Viewer and found the dubbing archives in an folder named L1ON, and the subtitles archives in an folder named Game that is inside of an folder named Localization.

So that means, the problem is in the file/code that set the game language based on console language and region setting, because with this problem the game is using the wrong language when i set the console language to Portuguese and region to The Americas.