Using an luck of sea level 100 (edited with NBTExplroer) it catches treasure every time. This is not a bug, it's just that level 3 luck of sea is low enough to make it barely worth noticeable. Because 5% changed to 8% percent luck of sea level 3 is not noticeable.
If you haven't read it, Apple made it two by two pixel, or DPI 200 percent, which has an effect of quartering its resolution to 1440 X 900. If apple didn't do this, you could barely read the screen. Since it requires hacking the OS system itself, it wouldn't work without that.
Issue is specific to Mac due to Apple, not Mojang, and it requires an hack to make it the full resolution. So not an issue to Minecraft. If I was a mod, I would close this as invalid.
It will probaily be fixed in next version, but I wish it was intended. To be 80 uses would be awesome.
No it is.not looting works in latest. Snapshots with thorns killing. Mobs read the tixcket thorns with looting.g wkrks