Information to duplicate it is key. Giving something that can't be duplicated in tests others make just makes it be put on hold waiting for something that clues them to the cause. This thread did that. Yours likely did not.
Printable View
This issue has been reported several times by different people over a couple of years. It is a very inconsistent problem and whilst it can be replicated, Carl has worked on it in the past (I'm pretty sure I'm right in saying this) but found no solution. It came up I remember in an official module and I had to redraw the occluders to fix it since there didn't seem to be any other way. So it's not for the lack of information or the lack of posts; it's a problem of not being able to easily find a solution.
Pindercarl understood the mechanism to duplicate it in other threads as he stated here? News to me, guess I missed that.