Minecraft wiki entry for Development_versions, associated text: MC-40512 – Stained glass panes are opaque in 3rd person mode.
MC-40527 – Twitch broadcast: Unknown error.
MC-40603 – 13w47c crashes at startup on Mac.
MC-40627 – Glass blocks in hotbar toggle backface culling on/off when selecting/deselecting a stained glass block.