I never use it, so I’m not used to expect a value to change during its life cycle.

It is effectively a new variable with it's own little allocation with the same name as other nearby variable. It is not a rewrite of the value of a single variable, which would be easier to reason about. Basically, that inner end could be named something else and everything would behave exactly the same, it would just be more readable.

This is not a bug, this is working as intended. It just trips me now and then. I've accidentally done the same stuff before...