My daughter's May 2019 Leon Cupra at its MOT this year, at 19.5K miles, got an advisory concerning the front offside damping "misting", when I swopped that car over to its summer wheels/tyres earlier this month (better late than never!), I noticed that this misting had probably progressed, or at least more oil had misted out, so, despite what "experts" say about "all VW Group cars suffer from this, not necessarily worth commenting on", from my experience and mechanical knowledge, as this misting is still happening and coating the upper area of that damper, I'd say that along with this oil there will also be a loss of some of the gas from this damper, so maybe the time is coming for that car to get both its adaptable dampers replaced!
I've noticed with some front wheel drive cars that we've owned, where they tend to be used mainly with only front occupants, that firstly the rear brake discs suffer from not being handed much work, and also, the rear dampers can suffer as well possibly due to lack of compression - that comment was first made to me when I discovered a rear damper was not working too well (exact detected functional failure/limitation now not remembered 30+ years on), and when I went into the Ford dealership to buy a new damper for her Fiesta, the parts guy said that this early life failure was being considered to have been aggravated by "lack of work/use" and it was happening, at that time, to many similar cars - although I'd reckon many many owners have not noticed this and unless it has become serious, it will not be detected by an MOT tester.
I have also found a reason to replace the rear dampers on my wife's previous 2002 VW Polo, for some reason that I've now forgotten, maybe I had checked the dampers while replacing the bump stops - known now as bumpers! Unfortunately I will soon need to do that bump stop replacing on my wife's current 2015 VW Polo, so maybe I'll find that its rear dampers are due replacement when I have them off to replace the bump stops!!