https://www.theguardian.com/technology/2018/jul/16/macbook-pro-keyboard-update-fix-dust-issues

Teardown exposes new silicone skirt around keys that could stop debris from blocking them

Despite Apple stating that new 2018 MacBook Pro keyboards were not designed to alleviate key failures due to dust, a teardown has revealed a new barrier under the keys that could stop them getting clogged up.