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That sounds like a correct way to do that. But if that doesn't work, try the investigate tool inside of the resolve mode. It takes out alot of the guessing games on what is wrong. I know that resolve mode can be intimidating, but try it out.
thanks
What gets me is when you mirror a pattern. If you want to change the pattern the mirror won't update and you have to delete then recreate the mirror. You'd hope a regeneration would fix it but it doesn't. 😉