It doesnt care which gamemode you have.

When I make a big waterfall with pistons to turn it on/off in a server, When I turn it off it starts disappearing and comming back a few times, And then everyone is kicked and it makes a world hole when you log back in. This isnt when I turn it on. I have the same problem in a "Madhouse" attraction, When the pistons "turn" the chamber, a huge worldhole appears and kicks everyone with the "Bad Compressed Data" error. I'll add a few screenshots to this showing you what I mean. This bug is in the game since Minecraft 1.4.4 (Or 1.4, Not sure, I think it's 1.4.4).
Another bug is, When you use the minecraft mod/bukkit plugin WorldEdit, When you edit something, huge worldholes appear almost every time. I don't know if you can fix this, But it would be great if you can.

Thanks already! Johan van Poppel.
(Sorry for my bad english, I'm from the netherlands!)

About the pictures, The first one is the worldhole when the waterfall goes down, I tried to make a screenshot with the waterfall disappearing, but then I was kicked (Second picture)
The 3rd one is the world hole after loggin back in. (You can see a minecart track and snow on the surface.)