I've been using Worldedit for a while now but just recently when I try to copy a section with stairs it rotates all the stairs to face the same direction. I'm pretty stumped on what the issue is, any help would be greatly appreciated. I've attached a photo showing the issue.
I've had the same issue, I think it started when they finally disabled block ids. I've also had problems with glass panes not connecting to anything when I place them with world edit and I think that might be for the same reason.
I don't have a solution for copying directly, but when setting or replacing stairs at least I've found that if you specify their direction in an NBT tag it works. You could do something like