Duplicate Node shortcut (Ctrl+D) only working sporadically

Recently, only in the last few weeks, Ctrl+D started behaving erratically. I don’t know what changed. I didn’t upgrade Unreal Engine. But now when I use Ctrl+D to duplicate a blueprint node, it only works sometimes. It’s seemingly random. It’ll work one second and then stop, and then work again (without leaving the editor or BP). It either works or it deselects what’s selected and does nothing else. I tried closing other programs but haven’t been able to narrow it down to anything. What could be happening here? Could this be a problem with CommonUI? I’ve noticed other editor UI issues after enabling Common UI. (Win 10, Unreal 5.4.4)

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