Stylelint is not working in any CSS files as soon as I add processors-arbitrary-tags in stylelintrc file

[aakashgill]

When I add "processors": ["@mapbox/stylelint-processor-arbitrary-tags"] in my .stylelintrc and run stylelint task on a PHP files, Linter does work.
But it stops working for other specified CSS file.

But as soon as I remove the "processors" from .stylelintrc, linter starts working on CSS files.

As you can see in the image, when there's no "processors" in .stylelintrc,
it gives me an error in style.css

But when I add "processors" in .stylelintrc,
it does not give an error in style.css, but gives an error in php file.