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I have never had this issue myself, but my hunch is that the visibility AABB isn't big enough and so when you look at those certain positions and angles, the camera is not looking at the AABB and so it disappears. However, if this is the case, I'm not sure why the player is disappearing also.
If you have a commit where the project does not have this bug, if it is not too far back what you may want to try is going back to that commit and then slowly adding back all of the changes to present, testing on each little change to see if the issue occurs. Then it should be possible to narrow in on what change specifically caused the issue, as it will suddenly occur after applying.
Also:
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