I was chasing a green soldier through a tunnel yesterday and tried to shoot him, but I had my blocks out and instead placed a block where he was standing. I think it was already crouching-room only so when I placed the block he became stuck. He ended up blowing himself up.

Don't know how to fix it, just wanted to make you aware.

Yeah, this can be quite annoying. But actually, it is the only option to block a griefer atm. (I managed to bury one griefer inside many blocks. He left after some flaming at me. :P)

Yes, this bug is well known and quite funny, I'm not sure if it needs to be fixed though :P