Warm/Cold Milk Storage

So today I discovered that you're not supposed to put warm milk with cold milk when you pump 😅 When I'd pump I would pour that milk into a bag in the fridge, and add to it throughout the day til it was full, and then put it in the freezer. So, why aren't you supposed to do that? 😅 How bad did I screw up? I have 30 oz. In the freezer so far (This is my third day using the pump), please tell me I don't have to toss it 😭