In some angles, in some positions, the game incorrectly calculates what should be rendered and doesn't everything.
Here's a screenshot: https://i.imgur.com/ep97anT.png
(Where it's blue and seems empty, there's a wall thee)
I can repreduce it 100% of the time, I just need to walk towards and away from a corner and I'll find a spot where not everything is rendered.
This also happens when walking around outside randomly.
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In third person it's even more obvious, I added a zip of the world while in that position and another screenshot. So you should be able to check the bug more easily.
I'm glad I was able to find a place where it can be repreduced 100% of the time, because it had been happening a lot when just wandering normally but I could never repreduce it.
I made sure tu use an unmodded version of Minecraft 1.12.2 to verify it wasn't some mod causing this.
Thank you for your report!
However, this issue is a Duplicate of MC-63070.
It has been linked to this report. If you have additional information, please add it to that report.
Please search before reporting, as it's likely that one exists already.
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