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Because of the newness of all the bits, I’m leaning towards a gummed up valve core as the source of the leak.
I’d unscrew the core, open the valve, and be sure the gasket in there is clean and that there’s no sealant accumulated on, preventing the valve closing securely.
Also, if the valve core pin is bent, as happens from poor pumping technique, that could also prevent the valve from sealing properly