The Minecraft app version as reported by Android is in fact 1.4.1.0 but the form will only let me enter 1.4.0.5.

Problem: Graphical issues that could be summarised as "missing polygons".

Verified on:

• Nexus 5X running Android 8.1.0 (Screenshot_20180521-123052.png)
• Nexus 10 running Android 5.1.1 (Screenshot_2018-05-22-03-58-38.png)

World was originally survival, copied to a creative world and another device to take the screenshots.

These occur around a very tall structure (bedrock to well above cloud level), including a large mob farm. A smaller mob farm of similar design, without the tall structure and in a flat world, doesn't suffer from the glitches.

1. Moving around the mob farm, sections of the walls become temporarily transparent with incompletely rendered interiors showing. It's notable that the transparent sections are 16 blocks high.
2. Adding or removing (cobblestone and other) blocks has the usual animation but the scene doesn't change immediately. It might take a minute or might depend on the PoV changing.
3. [possibly unrelated] Some flowing water in the farm ends up being turned (I'm not sure when, perhaps on chunk unload) into source blocks. This breaks the farm. I think was a one-off issue as, after removing all the water with sponges, water seems to flow even if it is not actually visible.

I can provide a .zip (~20M) of the world (62M) on request.

I tried turning off the various options in Video settings (fancy graphics in particular), but this made no difference.

This could be a duplicate of MCCE-7264.