Just tested in minecraft version 1.10.2 in SP mode.
No bug.
This appers to be a bug serverside.
I'll check again to see if its happening only in vanilla server.jar or with the spigot.jar
Its actually possible this could be a spigot.jar related bug.
further research on the matter.
if I go back to 1.8 I STILL cannot place grass blocks. and have them count.
however if I do ID.. stat.useitem.3
it counts not only grass, but dirt, coarse dirt and podzol as well which should be registering only with
the stat.useitem.2 ID ?
or am I wrong? Not really sure why, I thought I was using this command in version 1.8.8
but, apperntly its been glitching since version 1.8 atleast.
Aplogies, Crash report as been attached.
Also, I've added a bit more information to the report.