Same issue, though I just started new job and instantly updated everything to latest when unpacking new Macbook Pro 13 M1, 2020 , Monterery version 12.0.1 Power delivery PD doesn't work from my external display Philips PHL346E2C (model no: 346E2C model id: 346E2CUAE/00 ) over usb-c and I have to carry power adapter in my backpack and connect my laptop with two cables, one for display and one for power, this sucks, Apple please fix it. It worked one time but could not replicate it how to make it work again, though tried on different colleagues display model some Samsung and power delivery to macbook works with his display with my display's cable, so might be some issues with display models, brands, and OS software things. Hitting google with my own model keyword didn't returned any results, so broadened my searches with general keywords led me here.