"Ignored folders" advanced library setting doesn't work

As the title says, I practically just add folder names I wanted to exclude from the library scanner, but they are all keep getting scanned. I already tried resetting library, force update, force metadata, and even recreating the library.

Sorry for any mistake as I'm very new here, and somehow I don't find ANYTHING related to this except for something from a few years ago (using .nomedia). Meanwhile I check that this "ignored folders" is a very recent feature. Even the wiki is last updated years ago.

Below is the advanced settings I set.

Ignore folders

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Sadge, doesn't seem like this is easily solvable despite its simplicity.