casino says my free spins win needs provider review because payout was “unusual”

Won a chunk off some free spins last night and cashed out, but now I’m getting emails saying the slot provider is doing a “review” since the payout was unusual. They didn’t give a time estimate or any solid info, just that I need to wait while they look into it. Never had this happen before, at least not from a promo, and I’ve done enough bonus rounds to know my way around the usual T&Cs. Account is verified, same device, same everything.

Has anyone actually had a legit win from free spins held up like this before? I always keep screenshots and play history, but I’m not sure what’s normal for these so-called “provider reviews”. Did you eventually get paid or does it usually turn into a mess? Wondering if I should sit tight or start pressing support about it now. Anyone got experience with this?