Hey Community,
Maybe this question has been already discussed a lot. But this is very annoying issue
and should be discussed more than a lot 
Well, I have 2 boards Classic and nextGen.
I have my scrum board in classic board, where I have a general sprint from different classic projects.
Now I have another new NextGen project and I want to include tickets from this project into my classic board sprint.
But I exited when adding nextGen tickets to sprint they were not visible in my classic board, its annoying 
I am pretty sure, that lot of jira admins faced this issue, so need to solve it ASAP
thanks,
Arthur