Maybe not. I think the failure to wirelessy charge is a combination of software and hardware. I observed two things over the past two days with my 12 Mini after updating to 14.3. First, although a problem with wireless charging still exists, I perceive the ios update improved that somewhat. Second, I discovered, on the three stand up wireless charges I had since June, and with a new one of a different design just received, my 12 Mini will not reliably charge when sitting, as intended, on the bottom shelf. However, if I raise the phone above the bottom shelf by 1/4", it charges perfectly 100% of the time.
So, I am purely, guessing, but I hypothesize there are two things going on. First, I think it is reasonable the phone does a quality check of the inductive coupling before it allows wireless charging to start. Apple might have lowered the required quality threshold a bit and that might explain why charging appears to be somewhat less problematic after the 14.3 update. Second, the success associated with placing a 1/4" shim under the phone in order to make charging 100% reliable, might be related to the exceptionally small size of the 12 Mini where its charging coil sits lower than required for good inductive coupling. Anyway, just really reaching here but these guesses do offer an explanation for what I observed.