With Android 12 they introduced Material Design 3, the latest iteration of the design system used by Android and other Google products. Their designers haven't even bothered to publish a proper and usable spec this time, but Google marketed it as production ready in blog posts, Google I/O talks and press releases.

The published Material Design 3 spec is missing several basic components, it doesn't even have a checkbox. Google is inviting developers to migrate to the latest version of the design system, while their own teams at Angular and Flutter are now mixing M2 and M3 components and design concepts, and hitting roadblocks because of incompatible elevation and typography changes in certain components.

https://m3.material.io