I discovered this bug playing my new T1 Trinket deck...
If the top card of your library is revealed, and you
shuffle your library, the revealed image is not updated.
It stays the same as it was the turn before. So, when
you draw, you get a different card than was shown.
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Also, if you enable the top-card-of-library-is-face-up option,
and then you draw from the deck, the next top card for me is
not face-up, and worse, the option to make the top card
face-up is no longer in the context menu when I right-click
the library... Weird.