The new "private address" feature wreaked havoc on us once users started updating to iOS 14. We decided to tell them they had to turn it off (for many reasons). However, iOS 14 was/is still buggy, and we still had some clients being blacklisted for ARP Spoof even if they disabled private address. Updating to iOS 14.0.1 helped a lot with that. (you'll even see in the release notes that 14.0.1 address wifi issues, but they dont get very specific). Still in the middle of troubleshooting all scenarios and issues as they still creep up.
For example - we have three main SSIDs on campus. If youre phone has profiles for each one saved, and depending if private address toggle is on or off, and if those profiles are set for auto-connect, and if/when you time clearing the blacklist entry in between the user toggling things on/off themselves... you can see it can be a nightmare.