What you say is clear to me, what I am saying is that until SPPB3.8.8 you have used the Bootstrap 3 grid where-sm- is for 768px tablets and -md- is from 992px up and from bootstrap 4 this was changed being -sm- from 576px and -md- from 768px, as you can see they reduced the -sm- and -md- breakpoints for smaller screens and you in SPPB3 did it based on Bootstrap3.
Currently you are already recovering the previous column configuration but you are doing it from col-sm- of 768px to the current col-sm- of 576px, so you can imagine how crushed that is, the same with col-md of 992px at current col-md of 768px. What I am simply asking for is that instead of recovering old configurations at the same current breakpoint, they do so by going up 1 level to maintain the configuration for the same screen width, that is, instead of recovering col-sm in col-sm it is in col-md and instead of col-md be col-lg, this will keep the content settings at 768px and 992px and the millions of sites created with SPPB will thank you.