I am not sure if this is a bug or “works as intended” but it was rather nasty surprise for me. Content of nodes that are collapsed don’t get copied. I searched the documentation but I haven’t found anything about whether it should behave like that or not.
My scenario is that I often use checkvist to write down meeting notes, taking advantage of collapsing expanding points as needed. Then if the notes are important, I just copy/paste it in email for people present. It happened to me already few times that parts were missing because of this, so now I have to check everything first before copying it whether it is not collapsed. My expectation would be that collapsed/expanded state does not change the content so the result of ‘copy’ should be the same.