Having similar problems. WLAN disconnects when roaming at my workplace. After waking the phone, it takes quite a while to reconnect. this has started happening since ios 14.x ...and is definetely not fixed with 14.2.
This is going to be a disaster if it isnt fixed soon, we depend on wifi for calls on our premises (using cisco jabber).
Also this is using airwatch MDM deployed Wifi profile (WPA-Enterprise with Certificate based auth). So the issue is not (only) in WPA2 PSK or something.