Unluckily I have the same problem with a 2020 purchased Macbook Pro 2019 16".
The apple Servicecenter claims that only the 13" Macbooks would run under the extendet service program.
Was told that the 16" Macbooks are not qualified for this service program and therfore apple will not replace my display.
Any idea how to solve this problem without spendig a lot of money (donations)?
btw.: Removed bottem of the macbook, pressed a little bit against 1 flexcable and the problem disapeard during pressing (studied computer sience an therefore might be qualified to do this)!
That looks like it is a design or production problem of apple (we experienced also the flexgate problem with macbook 2016-2018)