Portal Multiple Models are executing even though 'Apply only the first matching Price Model' is true

Summary:

I have a use case where a Pricing model A has customer specific pricing and Model B has Customer Group specific pricing. Both models have common rule. Customer specific pricing takes precedance over Group specific one so inside this rule, Model A comes before Model B.
The expectation is that if the price is available in Model A then it should take that price and quit else it can go to next model to look for price.
I have set the pricing option as 'Apply only the first matching Price Model' to true.
Now when Customer name and group values are available, it takes price available in Model B.