It will break something, too as both maps are still in synch. If we decide one day to not synch it anymore, it would be different. But like that it will lead to double pinning and it can even result in less curation because it's not well seen on both sides. Actually, that is what happens most. We try to tell people. If you do it multiple times it can happen, that you will be excluded from curation.
Yes, we had some bugs that we had to fix. Now it's running well again.