Unlabeled buttons are bad for accessibility, see missing label:

https://cs.chromium.org/chromium/src/chrome/browser/resources/settings/people_page/fingerprint_list.html?rcl=e0ec68b9d09bda94fc434a6a5118e2fa01147cce&l=59

Please add an automated test when fixing issue to prevent regressions. See:
https://www.chromium.org/developers/accessibility/testing/axe-core