It is possible that the carrier did not include the 5G logos with their update. This would mean that you ARE getting 5G, but are simply not getting the indicator for 5G. Try doing a speed test (use multiple ones) and see what you are getting for actual bandwidth. The default o/s does not have the signal logos for 5G as each carrier has different logos for different levels of 5G, for instance AT&T has 3 (5Ge, 5G, and 5G+) and these are not all provided by Verizon. I am not saying that this IS what is happening to you, just throwing it out as a possibility.