MyApp requires signIn operation for purchase.
And also, `Purchases.logIn("my_app_user_id");` after signIn.
But, `created a new alias` executed about 1 month after purchased.
This occurs a few users. Why??
In the period, it has been used `$RC:AnonymouseID:xxx` instead of `my_app_user_id`.
It is not expected. it should create alias as `my_app_user_id` as soon as possible(ex. next to First seen using the app).
Any help, please
