TestFlight upgrade issue on iOS 14.4

Hi,

Our app uses VPN (Packet Tunnel Provider Network Extension). When we try to upgrade our app via TestFlight builds over slow internet, then VPN gets into weird mode where it keeps on connecting and disconnecting. Also, there is no internet in device and upgrade is stuck.

Once we manually stop VPN from Settings then only upgrade finishes. Here are exact repro steps:

1. On Mobile data only. All others switched off.

2. Start the TestFlight install.

3. It asks for permission to download or later on wi-fi.

4. Just leave it there without selecting any option for some time and the network will go off with VPN reconnecting.

We saw similar issues in upgrade from Testflight but it was resolved somewhere after 13.x (not sure of exact version though).

Is this a known regression?