I Winterized ............. but then this happened.

I've had to put on a glove and rub around the seal in my toilet. I never felt any debris, but the seal held after. If you have a really slow leak like it holds water until the next flush you can also just ignore it as when in storage there really is no need for water in the bowl. But before working on the valve I would put a tiny bit of water in the bowl and let it sit for a while to seep down and wet the dry seal before you open the valve.