Push notifications not working after transferring data from old iPhone to new

I transferred data from iPhone 8 to iPhone 12 mini, using the iTunes Backup / Device to device migration. I wasn't getting push notifications for one app that I was already installed on my old iPhone. I checked the push notification settings for that app, and everything is enabled as before. I toggled the settings to on/off but it did not help. I tried to log out and log back in to that app, but that also did not fix the issue. Then I deleted and reinstalled the app, and then at the time of login, the app asked me whether I want to allow push notifications. I clicked Allow, and now notifications for that app have started working. Is it common behaviour? If not how to handle this?