Yes, when you start the amend process the tax/refund may reset to zero. However, if you have a zero at the end of the amend process then quite probably you did not claim Foreign Tax Credit originally.
Do you remember going through that Foreign Tax Credit interview originally and putting in the tax withheld by PR? If you did not claim that credit then you do not need to amend.
It would be part of an amount on line 20 of your form 1040 which flowed from line 1 on your schedule 3 that generated a form 1116.
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