@Traveler101
Glad you were able to get the savings opened!
With the auto loan approval, there are other bona-fide parties involved: typically a car dealership, an insurance company and a state agency. They each would have perform their own due diligence to allow the their part of the total transaction to take place.
With respect to a new savings account, the due diligence is all on the bank (Chase) to avoid any potential fraud.
This is why I believe you got a great auto pre-approval amount but temporarily stalled on opening the savings from Chase.