Rerouted (regenerated, verified). Same repository and tag, but GitHub now builds the zip with different bytes, so it no longer matches the SHA-1 package.elm-lang.org recorded. The Lamdera package server serves a copy recovered from https://github.com/aforemny/material-components-web-elm.
What we checked: Tag 6.0.0 is still on github.com/aforemny/material-components-web-elm; its commit fa5f16f0eddc is from 2020-10-08 13:01 UTC, before the version was published (2020-10-08 13:03 UTC); every file Elm uses matches a copy in a Lamdera package cache from 2021-02-13, from before the change; elm.json is byte-identical to package.elm-lang.org's; the exposed modules match docs.json; the zip's SHA-1 is not the published one (GitHub's zip no longer comes out byte for byte the same), so the contents were checked instead.
The Lamdera compiler uses this copy and prints a one-line notice saying so. elm itself fails to download this version.
Details · package.elm-lang.org's zip: https://github.com/aforemny/material-components-web-elm/zipball/6.0.0/
Icon renders a Material Icon.
import Material.Icon as Icon
main =
Icon.icon [] "favorite"
Icon view function