Android : After minor refractoring existing android application to new project, home screen icon got removed

I had my existing android project going unmanageable due to unnecessary research codes, so I decided to create a new project with only necessary code that's required for the app. I uploaded the same on play store's beta environment. As the app got updated on my phone, the already existing app icon on home screen got removed. Did I make any mistake in the code development?

Please help