Look like the same as MCPE-9695
It's MCPE-6819 I think
Also appear when looking directly in front of you (In addition of up & down) on the 0.12.0.1 version for Windows 10.
[media]It is the same in the windows 10 edition.
Also happens in the nether, there are some locations with invisible blocks that might be chests inside fortresses and the blaze spawners are empty.
Yes it does
[media]