I believe this is just an implementation error. 

Specs
https://folio.googleplex.com/chrome-ux-specs-and-sources/Chrome%20Inner%20Pages/03-Settings/specs#%2FSPEC-cards_about.png%3Fz=width

I am not able to reproduce this on Linux or ChromeOS. 

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My device has a 1.5X scale factor so it might be something about non-integer scaling?
 

@dschuyler: Could this be another case of a 24x24 icon that looks distorted when downsized to 20x20?

Marking bugs (mostly lower priority ones) that I am unlikely to get to soon as Available.

This issue has been Available for over a year. If it's no longer important or seems unlikely to be fixed, please consider closing it out. If it is important, please re-triage the issue.

Sorry for the inconvenience if the bug really should have been left as Available.

For more details visit https://www.chromium.org/issue-tracking/autotriage - Your friendly Sheriffbot

Mac triage: It's definitely no longer clipped on canary (72.0.3622.0) so I'm calling this Fixed.