In my case the same thing happens on my cell phone and I didn't have this problem before.
Item don't generate in chest i have tested it a few Time, bastion chest are empty, village chest empty too, portal chest empty btw. Pls resolve this beug!
I tested and no problem for me with the latest beta drivers (14.11.2)
This bug as bin fix by amd on the latest amd drivers beta "[407431]: Minecraft sometimes produces corruption when changing video settings in windowed mode." (14.11.2 beta)
Release 1.8 have also this bug
That’s normal behavior, if you place the torch fast enough before the falling block updates, it won’t see that there ever was air before. Hope that helps!