Impaling on the new trident doesnt add any attack damage. Also couldn't find buried treasure with the new buried treasure maps

Yesterday I got a few tridents from the new drowned mob and went to see if you could enchant them in an enchanting table and it worked. On my second try I got Impaling V Unbreaking III and Loyalty III. Then I added Mending to it with an anvil. I tried it on a hostile mob and found it to be a 2 or 3 hit kill. Then I went and grabbed a regular trident and saw that it was also a two or three hit kill. I took screenshots of both tridents to show that they both had 8 attack damage even though one had Impaling V. I also had a problem where I would go directly above a spot where there was buried treasure and dig in all directions 15 or so blocks down and couldn't find anything. This was with brand new generated chunks. I don't know if I'm not looking in the right spot or what. Besides the two minor bugs I think that this is best update to Minecraft in ages and cant wait to play 1.3.