I haven’t seen the discussion you talk about as yet. I will say speculation runs rampant on this forum. But here is a response from support about why something didn’t print correctly.
I have seen the problem of missing components. The failure to print some of your components in the correct place may or may not be related. I can see by your file that it would take some time to fully populate the render. Many people would not be patient. Whether or not your problem is caused by the above is only something that can be determined by examining your log file. That aside… you would be well served to wait until the render is fully populated to avoid failed prints.
As far as the Preview being unrelated to the file that is generated… Yes and no. It isn’t looking at the file on the GF but according to the company is parsing the same information downloaded to your browser. We can’t know the timing between the GF itself and your browser. Is there a half second difference between Print light and Preview load? Is there are 30 second difference? No way to know. I prefer to take the advice of support and give the file time to fully download.