If I receive a jacket from a maker and there is a problem or defect in the leather that is visible to me right away or shortly after receipt of the jacket I will reach out to them without hesitation and insist that they correct this problem, probably with a complete remake of the jacket.
I don’t think you have that recourse when you source the leather and provide it to the maker. As I mentioned in an earlier post I have direct experience with this and when I discovered a flaw in the leather of my custom jacket there was nothing I could do about it.
Do you have pics of that flaw? Just curious.