Testing scenario: Both apps using the same firebase project and users collection

We've got two flutterflow apps using the same firebase project and users collections. Both are using phone authentication. When we login as user1 on app1 it works fine but but when we login as user2 on app2 it updates the login user for app1 on the session and every action we perform on app1 reflects user2 instead of user1 and viceversa. Is there any way to isolate the users and resolve this problem? Thanks!