I also ran into some difficulties by opening a blocs3 project with blocs4. At least I desided to build the project new from scratch. And I liked it to start with this new blank site. There were so many classes in the old project and I forgot the behavior of many of them. I like the new feature to write descriptions to classes.
Yes that’s the correct behaviour for Blocs 4. The parallax is now powered by JS so it works a little differently to the old version. In app it’s still using the same (old) effect which will be changing soon.
The main benefit of the new parallax style is that it works on mobile.