Problem with parallax scrolling

Hello, I am writing here because I could not find an answer to my problem, I need to fix an image in the background in a block that remains static until the next block that should cover it scrolls, instead the parallax effect of blocs 4 it scrolls up, slower, I could not find a solution to this problem of mine, it seems that this did not happen on blocs 3 which I have never used and that this is a common problem for many other users. is there any way to solve this problem?
I hope I was clear in my exposition of the problem …

A thousand thanks…

You can do this by using a Class. Add a background image, set the Attachment to fixed,



The result is…