Birch leaves do not use leaves_birch.png in snapshot 13w24a (and don't use leaves_spruce_opaque.png leaves_birch_opaque.png when using fast graphics).
Edit: Copy/pasted the wrong file name there. Sorry!
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Sorry about the confusion, I copy/pasted the wrong filename when I wrote the report (I hate typing file names). Those attachments demonstrate the issue perfectly, though. Thanks!
Confirmed not using birch leaves, but opaque spruce is being used.