does withdrawing right after claiming rakeback make crypto casinos hold funds

Just noticed something kinda weird on my last two cashouts. I hit my rakeback, grabbed it, then cashed out right away, and both times the crypto site took like hours longer than usual to process. Made me wonder if there's something in their system that flags quick withdrawals after promos like that, like maybe they think it's some kinda abuse or bot action or whatever.

Anyone else run into this? I get wanting to minimize playthrough when the cards aren’t falling my way, but not trying to game the system, just taking my shot and bouncing if the run is cold. Would be good to know if this is a common thing or if I'm just paranoid.