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rails 6 favicon.ico Webpacker can't find favicon.ico
const faviconsContext = require.context(
Check this article https://dev.to/kattak2k/adding-a-favicon-to-your-site-using-webpacker-in-rails-6-2m2h looks like it contained the answer to your question.
By default, the helper in Rails looks for the favicons in the assets/images folder. Webpack does not ;-)