MCPE-8222Since 0.8.0, glass, glass panes, grass, iron bars, cocoa beans, and even mobs disappear when being far away (creative and survival)
The first is when close up to the items, the second is when looking far away from them
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Resolution: Unresolved → Works As Intended
This is not a joke, when looking very closely on the image to the right, there is no glass nor any of the items listed in the issue, a fix for 0.11.0
Works As Intended. This is optimization for lower-end devices.
I recommend checking the Minecraft Wiki prior to reporting an issue on the bugtracker, as what seems to be a bug to you may actually be intended.