Simulate app update

I am aware of this link: - https://stackoverflow.com/questions/12468180/simulating-app-upgrade-in-ios Here is my scenario: 1. I uploaded the 2.38.0 version in TestFlight. 2. I installed the app via TestFlight app. 3. I put the newer version 3.2.0 in TestFlight. 4. TestFlight signal an update for my app. 5. I updated the app. 6. All app data from 2.38.0 was deleted. My questions: 1. Is this normal? (to erase all data from the older app when updating from TestFlight) 2. How can I simulate app update?