Stylelint throwing a fit

I’ve used a .stylelintignore file with Sage for years declaring this path to ignore:

With Sage 9.0.10, I get this back after running yarn start:

Webpack is watching the files…

Error: No files matching the pattern "/Volumes/Evo/Local Sites/mysite/app/public/wp-content/themes/sage-mysite/resources/assets/**/*.s?(c|a)ss" were found.
    at /Volumes/Evo/Local Sites/mysite/app/public/wp-content/themes/sage-mysite/node_modules/stylelint/lib/standalone.js:212:12
    at processTicksAndRejections (internal/process/task_queues.js:93:5)
error Command failed with exit code 1.

You can clearly see the error is missing a key directory called styles as specified in my stylelintignore file.

Has something changed in Sage?