The Exam card seems to not work on the cards forgotten this round? Not sure about it, still trying to gather more information. Here you can see The Exam on the top of discard pile and Subconscious in the Forgotten pile (it's the only card there). I've used Exam and it shuffled Clown back to the draw pile, but not the Subconscious. And there were no other forgotten cards beside Clown and Subconscious when I've activated Exam.
UPD: I suspected that maybe the root of the problem is somehow related to enhancement, but in later turns Subconscious was "remembered" from forgotten pile successfully.
UPD2: Had recreated this bug again with both Clown card - looks like being forgotten in the same round the Exam is played is indeed the issue.
UPD3: Looks like the bug specifically affects the last card played in the same turn with the Exam. I've managed to forget two cards and use (upgraded) Exam to remember them - the one played second remained forgotten.