Clint Kennedy

It's basically just destroying the remainder of 1 block. It's not completely destroying all blocks. Although this is still obviously an issue, it's not as bad as it would seem, but still of course bad! 😃 Essentially it sees that there is one slot open, so it fills it with the first 7 blocks to 63. Then it sees that it can fill one more item, it does so, but doesn't know what to do with the remainder, so apparently it just destroys it. If you have 8 blocks exactly then you wind up with no blocks left. If you have more than 8 blocks, then you wind up with how ever many blocks you had minus 8. This same effect happens where the last block loses its remainder all the way up to 8 free inventory slots. The good news is is that for each additional empty slot, you have less of a remainder that you're losing 😃

Iron golems don't jump and they are also sinking. I have personally sunk through the floor multiple times while playing on an smp server as well while just running.

would it be possible to see if the fix for the armor stands can be applied to iron golems and other mobs?
https://bugs.mojang.com/browse/MC-119
thanks!

Just confirmed it still happens in 1434b. Had all 4 of my iron golems above ground in my slime farm, ran around for about a minute and one was sunk through to the rails 1 block below.

You can do this by just hitting them with a snowball and getting them to drop as well. Very easy to reproduce. Here's a gyfcat:
http://gfycat.com/AffectionateActiveAurochs
and here's a youtube video:
https://www.youtube.com/watch?v=v8FFKvbhMdY

Here's a youtube video showing the bug but the guy doesn't quite recognize it's a bug
https://www.youtube.com/watch?v=v8FFKvbhMdY

Still happening in latest snapshot 14w33c
Iron golems routinely sink through the ground into the hopper minecart tracks 1 block below. Happens several times in an hour of play.

Same issue.
[Server thread/ERROR]: Couldn't set beacon
java.lang.IndexOutOfBoundsException
at io.netty.buffer.EmptyByteBuf.readInt(EmptyByteBuf.java:470) ~[minecraft_server.jar:?]
at hb.readInt(SourceFile:639) ~[minecraft_server.jar:?]
at rg.a(SourceFile:1051) [minecraft_server.jar:?]
at ma.a(SourceFile:55) [minecraft_server.jar:?]
at ma.a(SourceFile:8) [minecraft_server.jar:?]
at ie.run(SourceFile:13) [minecraft_server.jar:?]
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471) [?:1.7.0_51]
at java.util.concurrent.FutureTask.run(FutureTask.java:262) [?:1.7.0_51]
at net.minecraft.server.MinecraftServer.y(SourceFile:575) [minecraft_server.jar:?]
at pl.y(SourceFile:305) [minecraft_server.jar:?]
at net.minecraft.server.MinecraftServer.x(SourceFile:530) [minecraft_server.jar:?]
at net.minecraft.server.MinecraftServer.run(SourceFile:446) [minecraft_server.jar:?]
at java.lang.Thread.run(Thread.java:744) [?:1.7.0_51]

This did indeed used to work.
Just search "redstone ore door" or "redstone ore trap" on google
here are a few:
http://www.youtube.com/watch?v=Z4woGpume30
http://www.youtube.com/watch?v=DWTEB3zU8fw
http://www.youtube.com/watch?v=QqWuxcLdtEo
http://www.youtube.com/watch?v=fpLZZIdWYIQ
http://www.minecraftforum.net/topic/741886-hidden-piston-door-activated-by-clicking-redstone-ore-video/

Thanks!