[Bug] ECS disappearing Entities

This is related to my other thread where I encountered an issue where cubes disappeared out of my view. I've finally boiled it down to the smallest bits.

I've created a new scene with simplest possible demo which spawns entity cubes in random positions around 0, 0, 0. There is a zip in the attachments. Copy the files into a new project, make sure you have ECS in packages then open the scene in Scenes folder. The entity cubes around spawned all around 0, 0, 0, I put cube "LookHere" there for position reference. Take a look around, rotate your Scene View. You will see that entities are consistently disappearing but for no obvious reason. It's all standard settings, nothing has been changed.

 

ECS/DOTS questions rarely get answered when posted outside of their dedicated forum. So I'd post this thread over there instead. People don't like to download random zip files from unknown people, so it is better to just post your code using CODE tags directly in the forum. If you think this is really a bug, it is unlikely the issue gets fixed without filing a formal bug report.

https://forum.unity.com/forums/data-oriented-technology-stack.147/
https://unity3d.com/unity/qa/bug-reporting

 

Will post over there, thanks.

As for zip, its kind of hard to just post code, because its the entire project. The code itself comes from a video tutorial where the code works, but there's just a weird set of circumstances which make it bug out, which can only be expressed through scene files.