EDIT: I somehow missed the already open ticket on this--I was searching for "pick" and not "middle". My bad.
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While in Creative mode, using the pick block button on a Boat will always yield an Oak Boat, regardless of the wood type of the original.
This also affects 15w41b, but I can't get the bug tracker to acknowledge that as a valid version.
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This issue duplicates MC-89917

Man, and I thought I'd searched so diligently. My bad.

Affects 15w43a