I moved back to SPPB 3.8.8 when I couldn't get SPPB 4.0.1 to save page changes. I just tried 4.0.4 to see if it would work for me now, and learned right away it royally screwed up the animations and sizing on my feature boxes at https://www.certifiedinfosec.com/.
I have the feature boxes at set for fadeinleftbig animation, which has worked great through 3.8.8. When I installed SPPB 4.0.4, the animations went from the previous mild to after-upgrade wild. The animations would only go one-way. They would not auto-reverse after mouse-out - which left my home page looking like Picasso's interpretation of an Alice-in-Wonderland fun house.
I went back to 3.8.8 and all is well. 4.x is sucking so far imho. Really.
Update: I tried 4.05. Same result. Here is the homepage on a lab site at https://staging.certifiedinfosec.com. Compare the feaurebox animations and sizes to the 3.8.8 on our live site at https://www.certifiedinfosec.com. If such a simple thing gets broken, I don't even look for all of the other problems under all of the stones in the rest of the site. I buy into a template and framework to make up for my own lack of website coding competence. Not really seeing the benefit with SPPB 4.x. I can do broken all on my own with no help from Joomshaper.