If you create a long enough card where you have to scroll and the “+” that opens the menu by clicking is not visible, the menu will never be rendered if you press /. And like the title says, it still receives input in this state, and I believe the various options in the menu could even be selected if you typed the right thing and pressed enter. Even if you scroll up after pressing / the menu will still not show up until you close it in some way and then open it again. (usually I just press the button at that point because I think pressing / will scroll? can’t remember)
I have not done thorough testing to make sure that the reproduce condition is that the “+” button is not visible, it might be that card is long enough that the entire menu would be invisible if it opened.