White screen when install app from TestFlight - ionic Cordova

I have develop app using ionic (Cordova) for android & iOS platform, when i test app in debug mode and install app using diawi link it is working fine, but when install app from TestFlight i got white screen. but i got few strange scenario as 1). When i turn internet off it is loading fine and i have got login screen 2). When i swipe screen from left to right then i got the login screen & it is working fine.

ionic: “3.12.0”,
npm: “6.14.16”,
Ionic CLI : 5.4.16
Cordova 8.1.1
XCode : 13.0