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Can you try opening and closing the valve a few times to see if you can get it to seat properly?Found a manual online about the winterizing process and the only thing it mentions is the valve you turned to bypass the water heater.
Without anything else in the system it would seem like the valve is not isolating the line going to the water heater completely.
A few options I guess…
1. Winterize then drain the water heater of the fluid
2. Add an additional shutoff valve on the line going to the water heater to isolate properly
3. Swap out the current valve with a new one
Just my thoughts and info