There was no problem updating and all seemed well. However, beware, I think there is a speed problem with the PCIE BUS. My speed tests were all 1/2 of what they should be on all my built in drives. My Western Digital SN 850 which usually runs at 5700 MB/sec was running at 2500 MB/sec. After much trouble shooting which gave me a lot of extra work, I found that if I use my 12.2.1 backup, all the drive speed tests were normal on the built in drives. I duplicated these tests multiple times. Using Casey's 0.7.8 EFI. It seems like there is a problem with 12.3. On my MacBook Pro M1, there was no such problem.