I was thinking it is a feature, but here is a difference between backend and front so now I think it is a bug. The loop starts bill of iterations from 1, not from 0 as Index in ForEachLoop. And this making a lot of confusion and need to subtract-blocks addition.
Will be checked
There are indeed differences in execution on the backend and frontend. Use calculation now if you need an index. We will think about how to lead to one type