The wireless charger that works with my 8 and not my 13 is in my Tesla. I cannot change the wireless charger in the car as it's built in so some of the suggestions in the thread are not applicable. I can plug the phone in with a cable into the USB in the car, but that is not very convenient as the USB is in the glove box so that has to be open and I need to remember a cable rather than just putting the phone on top of the charger. It's a retrograde step.
If, as some suggest, that the wireless charging doesn't work because the camera lens sticks out slightly from the back of the phone thereby preventing a good wireless connection then it's a massive and rather obvious design flaw in the phone.