Thank you. So there is exactly the same manufacturing number of "HB-1B", although the 'holes' do look visually ever so slightly larger which is interesting.
I think what's plausible here is different manufacturers. Seeing as it's the same model number, and a change in production would require significant retooling to manufacture. Therefore you would have a different model number (To keep track of production within the factory, it's just how they work).
Therefore it's still possible that either it's pot luck on which you get, with one being more prone than the other. This would explain why some have issues and others don't. It is also possible that Apple have stopped using a certain supplier due to this small issue, and therefore all 2017 models are shipping with the other one, or they are using them less.
From a production point of view, this is the same model of key. So I feel this is a question of whether Apple have stopped using the manufacturer or not. If people are still reporting issues with 2017 then I would suggest they haven't.
Also thank you again for your images
@JustTryToHelp, at least we are getting some form of credible evidence.