Tax Planner: how Credit entries are treated

BK

In the Tax Planner, if my final tax liability is zero, I am not able to apply any refundable tax credits.

Example1: I have zero tax liability and my withholding value is also zero. I know I will qualify for a certain tax credit which $500 of it is "refundable". So I entered $500 in the Tax Planner: in the Other Tax Credits > Credits > User Entered field. My expectation was to see a $500 refund, but it remained at zero. (yes I did refresh)

Example2: I have a $200 Refund Due shown in the Tax Planner. I enter the $500 in the Credits field, expecting my Refund Due to become $700. But it remains at $200.

Of course if I have remaining tax due or withholding amount, it will deduct it from that but will not go above it.

I am not expecting Quicken to be a tax program but I thought that was the purpose of the Credits field. In my testing, any value entered in the Credits field is almost treated like a "non-refundable tax credit". Is this by design?

My primary setup is R62.16 and test is R65.17. TIA