I have the same problem as many others where the original USBC charge cable, and all other USB C chargers and cables, no longer work with my IPad Pro. I haven’t seen a solution addressed here yet. I can only charge using USBA to USBC cables, which are slower. Why isn’t there a common solution for this yet?
iPad Pro 11-inch Wi-Fi, Cellular
Whilst not suggesting that you yourself do not have a problem, I have not noted any issues with charging using USB-C to USB-C charging cables with an iPad Pro - either before or after updating from iPadOS 14.8 to 15.0.
These support pages should help with troubleshooting:
Charge and monitor the iPad battery - Apple Support
If your iPad won't charge – Apple Support
Troubleshooting generally requires substitution of the Power Adapter and cable for another known-good item.
Disregard my post. I was able to figure out the problem. Seems rare, but I actually had TWO faulty usbC cords.
USB C to USB C charging
