Put the summary of the bug you're having here

What I expected to happen was...:
to give the player stone

What actually happened was...:
It said it would have given it to me, but either drops somewhere else, or not at all

Steps to Reproduce:
1. Place a command block "give @a stone" and run it
2. you will receive stone
3. do /kill
4. run command block 1 again, try it at different standing position
5. the item will spawn somewhere else in front of the command block

it does not work for
clear
give
kill
gamemode

and possibly more...