In the latest release (v20.0.0) Puppeteer switches from Chromium binaries to Chrome for Testing binaries by default. Since the binary is different the change is marked as breaking.

Background document from Google about the new Chrome For Testing brand: https://docs.google.com/document/d/1XJvxyqAQjhPfJ0rX84PjfXXb...

I don't know exactly what the impact is for the future of Puppeteer and Chromium. Maybe someone can share their thoughts on this.