It would be helpful if you indicated where in C::B with regards to which dialog/window/area you want to scroll past the end.
Also why do you want to scroll past the end when the end should be the end, but be aware I have no idea what area the end relates to. Also be aware that there have been changes in the nightly releases for the way scrolling in the build logs works or if you interact with it then it does something differently compare to 20.03, but this was a while ago.
You could try the nightly build to see if it fixes what you want as there are allot of changes in the nightly build compared to 20.03.