There's no fundamental mechanism (at least that I'm aware) that stops a high trust system from awarding funds to a risky venture. If that's not happening it's a systemic problem (or feature as the case might be) as opposed to some fundamental mechanism dictating covariance.

I think in practice the conditions that lead to high trust societies forming also tend to lead to culturally valuing predictability which translates to a bias against risk. But that's not an inherent part of high trust rather that's just how things happen to be at a given point in time.