I have a 2018 Octavia SE with the standard infotainment touch screen with touchscreen buttons and smartlink (not sure if that makes it bolero, amundsen or whatever). I have noticed a little vertical line, about 2/3rds from the left, running through the screen of what I would deem to be dead pixels. It's mostly noticeable when it is displaying brighter hues - ie when displaying maps through the smartlink. Turning off/on doesn't make a difference, it's there in every mode (you can see it in radio station logos for example).
I called in and showed my dealer when I was passing yesterday who agreed that I am not imagining things. I tried to photograph it but it just doesn't show it's so faint.
So the car is booked in for investigation next week - they have to go through the full process as they have never seen that sort of fault before but the tech suggested that they will probably end up replacing the screen and dispatching the faulty unit back to Skoda for investigation. Watch this space.
Not a good sign though - I've only had the car 4 months. As always, it's the techy intricate stuff that acts up first - all the mechanical stuff feels pretty bombproof so far.