Steps to reproduce
I had this command on a shortcut (ctrl3). If I try to enter the same shortcut, it appears in red. But I can't another red shortcut in double. It's not a native shortcut neither, because it doesn't appear with a new vault.
so I opened the shortcuts.json I can find the shortcut and erase it. But I just wanted to report this so you can see by yourself. apparently you deleted the command from the palette, if I'm right. but it remains in shortcuts...