Old .profile content isn't reset

I'm not sure if I miss anything or this is an actual bug.
On iPhone, I believe forcing close a-shell kills the current session, and then a-shell will start with fresh config + reload .profile.
But let's say .profile has `export A=a` for the current session, which mean `$A` is set to `a`.
If .profile now removes that line, and adds `export B=b`, forcing restart the session will set both variables.