Fwiw, I measured and all the shoes in my closet apparently suffer from this same abomination (~1 cm).
Just looked at all my shoes which are mostly from Vass and EG and they vary with some toes being lower and some being higher off the ground.
TC - seems like we better put our shoes up on B&S fast!
But in all seriousness, these are handmade products and I expect these small kinds of variances. It's part of the game. The same thing happens with custom suits. Even from the same maker each product has small differences due to the fabric being used, tailor"s mood on the day of cutting, specific sewer finishing the details, etc. All of these details add up to the character of that particular garment or pair of shoes. That's not a fault in my book.