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Hi,Here in France, in my region, there are plenty of chestnut ( it's always a pleasure to gather them in autumn.. )and I can say that I never saw such a young tree bears flowers, so I think it has been grafted, you have a grafted chestnut:)
one of my 3 plants from grocery store chestnuts flowered at 2 years
Chestnuts need to be cold stratified to sprout. I leave them in a plastic bag in the fridge over winter then plant them out in the spring.