Sometimes you can put a block in the place you are standing on, you should not be able to do that. When placing a block like that you are being 'slipped' out of the block and you can easily suffocate.
MC-12674
You can place blocks where you are standing
Resolved
Duplicate
0
Crom Oxi
(Unassigned)
Unconfirmed
Minecraft 1.5.1
Retrieved
Duplicate of MC-2208, please use the search function to see if your bug has already been submitted. Currently over 54% of tickets are being closed as duplicate.