macOS UserDefaults auto-populates older after deleting and saving data

Saving data first time in UserDefaults on macOS creates a plist file at Containers folder path but after deleting and saving different data next time, previuos data(before deleting the app folder) also populates in plist file.

if let test = UserDefaults(suiteName: "my_test_app_userdefaults_suite") { test.setValue("opt_in_1", forKey: "email_1") test.setValue("opt_in_2", forKey: "email_2") test.setValue("opt_in_3", forKey: "email_3") test.synchronize() }

Steps:

1. Run the macOS app with above source code, which saves key-value pairs in UserDefaults.
2. Checked the UserDefaults plist at path /Users/rahulmahajan/Library/Containers/com.TestuUserDefaults/Data/Library/Preferences/my_test_app_userdefaults_suite.plist and all the data is available there, which is good.
3. Now, deleted the app folder at path /Users/rahulmahajan/Library/Containers/com.TestuUserDefaults.
4. Commented the opt_in_2 and opt_in_3 statements, ran the app.
5. Checked the plist at path from Step-2, the lines commented in Step-4 are auto-populated in plist.