Pick block on all Boat types gives Oak Boat

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.