Affects Version/s: Minecraft 1.9.2
Fix Version/s: None
Environment:'os.name' = 'Mac OS X'
'os.version' = '10.11.3'
'os.arch' = 'x86_64'
'java.version' = '1.8.0_74'
'java.vendor' = 'Oracle Corporation'
'sun.arch.data.model' = '64'
If you put a sand block on the double tall grass and break the lower part of the double tall grass, the sand block won't fall. I think the reason is that when you break the lower part of the double tall grass, it won't cause the block update of the higher part of the double tall grass, so the sand block won't update too.
The same problem comes up with all the double_plant.