Navigation activity keep running in background

I've just write these lines in beta thread but I want also report it here because I think that is a bug that could impact battery life.

I noticed that there is a bug in navigation activity: if you try to navigate to somewhere and than stop and delete navigation, it seems that navigation activity keep run in background; today while I was trying to configure data pages in pool swim activity, I found "navigation settings" menu just near to pool swim configuration menu and while I was swimming in the pool and I was changing data pages, it appeared also navigation pages like map ETA, ete ecc... The only way to stop this crazy thing is to keep pressed up button went to navigation, set a fake destination, went back to swimming pool data pages, keep pressed up button and that selected stop navigation!
After this trick navigation menu is no more present in swimming pool settings and in other activity setting (like run, walk, bike ecc...)

As I write, it seems that once you use navigation activity once, it remains in background...