Hey, I had a similar problem. It worked just fine yesterday but I woke up today to the keyboard shortcuts not working. I didn’t update godot yet and I’m just on 4.4, not 4.4.1 stable. 4.4 has been working for me though. The problem with control+D is that I can’t easily paste into other scenes.
What you have here is an opportunity to prevent code duplication. Save the branch of the node you’re interested in as its own scene. Then add an instance of that saved scene in your target scene.