"My instincts feel that they should be frozen prior to being cooked. Thats what we do for pierogi and ravioli. I feel that freezing them after being cooked just adds more moisture and risking consistency issues that may happen as a result of the freezing."
You are correct. It has been a few years since I have made this but, after one mess, I always froze them uncooked.
Disclaimer: My experiences may not be as someone else might think correct.. Life goes on..