They said, my app is not working on iPad 14.6. But, in the sandbox environment, it is working on iPad 14.6, as I have that device. There are many forums where people say that their issue was resolved automatically, whether others are still trying to figure it out after 2-3 rejections.
If this issue is happening so many times, Apple should learn from this and help us to provide a way where we get the solutions as well.