My RPi 4 consumes about 0.5A after executing
sudo halt, while according to this post it should draw at least an order of magnitude less (0.069A). The green LED blinks several times then goes off, but the device seems to stay powered indefinitely. Notably, the 3.3V pins on the GPIO remain powered, and the LED on the network interface keeps blinking.
This happens of a vanilla Raspbian Buster image with all upgrades installed. The RPi is powered via the USB-C connector. Additionally, it's connected to Ethernet, there's an HDMI screen attached to it, as well as a wireless USB keyboard / mouse. Disconnecting those cables doesn't change the power consumption significantly.
The only hardware modification present on the board is a reset button connected to
GLOBAL_EN signal and ground on the J2. Essentially, when the button is not pressed, the board connectivity is not modified in any way. When the
GLOBAL_EN signal is grounded, the current drops to 0.15A.