The Raspberry Pi 4 promises to be a boon for homebrew gadget makers, but it has flaw that could pose headaches for some users. Tyler Ward and others have discovered that the Pi 4 isn't using a properly designed USB-C port. Instead of giving two pins their own resistor, Raspberry Pi created a custom circuit that has them sharing a single resistor. As a result, some USB-C chargers (those with "e-marked" cables) will only recognize the Pi 4 as an audio accessory and won't charge it.
Via: Ars Technica
Source: Tyler Ward