When you say light downhill, what are you actually describing? Are you describing XC trails that have some descending, or are you talking about green or blue rated bike park style downhill trails? A rigid fork is not likely to survive long when the bike's wheels leave the ground.
That is the kind of riding that rigid MTB's began with 30 years ago. The thing that will kill a rigid carbon fork is front impact, so as long as you're lifting the wheel and not running into obstacles and letting the wheel do the impact absorption, the carbon fork shouldn't be any riskier than a rigid steel or alloy fork. Although those would bend before snapping.
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