The Ctrl+shift+V shortcut (paste and match style) used to work when you pasted something into a footnote, but no longer does anything. Works fine in main text, but you have to go the “Edit” menu and choose the command “paste and match style” if you want to copy text into a footnote without formatting it.
Just checked and this seems to be the case with all text fields in the Inspector panel (comment, synopsis, etc.); the keyboard shortcut doesn’t work for any of them.