Just tested Treasure Hunter boon, the result is always 4 resources in Cold run (with or without boon).
So there a bug, unless it's not supposed to stack with the Double Professions event, in which case it would a poor design of the event (or Boon).
I don't remember what's the base drop amount though (i. e. with no boon and no event).
For the sake of completeness, I'll mention that other boon in tests was Mount Speed Bonus:
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