I tried to summon a wither and the blocks were left behind. Confirmed to work on easy difficulty and up.
What I expected to happen was...:
The wither would spawn and the soul sand blocks would disappear.
What actually happened was...:
The wither spawned and left the blocks behind.
Steps to Reproduce:
1. Summon a wither
2. Blocks will stay until right-clicked or until you re-enter the world
Linked issues
is duplicated by 12
Attachments
Comments 26
You need to be on at least easy mode. Not peaceful
herp derp. I forgot. Retested and it did leave blocks.
Unable to reproduce.

Reopened.
Tested in 13w10b, bug is still working
@zombie hunter. THATS WHAT I'M SAYING
one OFFICIAL version and 15 damn snapshots and I've tweeted this to them 300 times and they reply to something else I said while trying to get them to see it.
DAMNNN
and pre release tomorrow!
I shouldnt have to make sure I face the arms North to South
when you make it faceing East to west it keeps all the blocks EXCEPT the last wither head placed and the soul sand it was put on.
all 3 dimentions and all three difficulties and all gamemodes.

Yep, still happens in 13w10b. Such weird and easy-to-fix bugs need more upvotes !!!
YES!!! IT'S FIXED!!!
I tried that and a wither didn't spawn at all. The blocks just stayed