slime block bug in 14w26c

bug 1:slime block duplication
what I expect
slime block will not duplicate if you make up and down stack like in 2014-07-02_18.57.18.png 2014-07-02_19.01.04.png 2014-07-02_19.01.08.png not _thumb_68854.png

note :this stack is connect to up and down slime block in less than 1 second. see in youtube

what it was
slime block is duplicate 2014-07-02_19.03.01.png 2014-07-02_19.03.04.png

bug 2:if you jump onto slime block that duplicated it will hurt you and you will jump higher than usual
what I expect
if you jump on slime block that duplicated it won't hurt you

what it was
if you jump on slime block that duplicated it will hurt you
note : see in youtube

bug 3:if you quit that world and reopen that slime block will disapear
what I expect
slime block will stay at that

what it was
it change to air!
note : see in youtube

see at http://youtu.be/FHtzMbEB5G0