Borrowed Time did not return exiled card when destroyed by sideboard spell.
My Book of Glorious Deeds was exiled by Borrowed Time.
I used The Raven's Warning to pull Invoke the Divine from my sideboard.
After I drew it, I cast it immediately on Borrow Time, however even though Borrowed Time entered the graveyard, my Book remained exiled.
This continued even after my turn ended. My opponent surrendered on their turn, so yay, but this appears to be a bug nonetheless.
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