Custom (Perspective) to display last perspective view

I don't know why this is the intended behavior for 'Custom (Perspective)', but it does almost the same thing as 'Perspective/Orthographic View', just without the toggle. I was expecting, that 'Custom (Perspective)' would switch to the last used perspective view. So that I can enter Top View, for example, and then switch back to my previous perspective view.

Did you enable option:- "Edit-> Preference" -> "Options-> Custom/Front/Back...view has own camera settings"?

Thanks, steve! Now it works as I would expect. This option is news to me, what are its implications?

It was in update March-31.

* Edit > Preference > Options > Custom/Front/Back/... View has own camera settings. If this option is On, these views will have different eye points and focus points which do not affect each other when switch between these views whthin the same viewport.