I have the same issue and the time between copy and paste is not the problem, I was very fast and tried it several times ;-)
But the xml way still works, so I can edit the CAF Champions League and correct all the wrong data
What is the recommended way to edit advanced rules of international competitions like the CAF Champions League?
I found some old manuals where they have added this competition to a nation to make it visible in advanced rules for this nation.
But I also found some files where this was implemented in a different way, see screenshot attached.
I just need to know how to navigate to this view to edit this competition.
Thanks in advance!