casino cancelled my pending withdraw because i kept playing with leftover balance

Had something weird happen with a crypto casino I play at and wanted some takes. I put in a withdrawal request after a nice blackjack run, but still had a small leftover in my account. Couldn’t resist playing a few more hands with that bit, and I went back to check my withdrawal only to see it was cancelled. Support told me playing with any balance after a cashout request voids the withdrawal and you have to do it again from scratch.

First, is that normal? Feels strange since technically it’s your own money and not bonus cash. I’ve always respected the variance and try not to get tilted by swings, but this caught me off guard. My habit is to leave a few chips behind and go for late-night side bets while I wait for things to process. Has anyone else had withdrawals cancelled just for spending leftover balance, or is this just one of those hidden terms crypto sites do? Starting to wonder if I should just cash out everything every time.