Hi,
Just ran into this issue (of not having Power Delivery work)with an MacBook (M1Pro) in combination with a Philips 346P1 display. After some research I found that (for me) resetting the NVRAM works. After doing so power delivery works. However, it only works for as long as the USB C cable remains connected between the MacBook and the display. After unplugging I need to reset NVRAM again to get the functionality back.
Hope Apple comes with a real fix soon, seems to be way overdue.
LatinSensei
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