I used shears on double fern. I expected to get fern. Got black and pink box that said it was grass (see screenshot 1). For the hell of it, I placed said box on a block of dirt. Got dead (desert) grass. Kind of fun, but then again....I still want the fern 😃
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Confirmed for 14w26a and b

Double Tallgrass (#175/2) when broken by hand now drops itself. However, when broken with shears, it drops two Fern (#31/2).
Large Fern (#175/3) drops nothing when broken by hand. When broken with shears, it drops two blocks with the black-and-purple "missing" texture: Grass (#31/3).
So it's dropping a different block, but with the same metadata value.
Confirmed