Reliable emergency calls

Is it supposed to be able to minimize emergency call? Like swipe left to get access to some other application?

A while ago I called 112 (Finland). Call itself worked ok, but it was not possible to get access to any other app; red emergency call app (sfos phone app turned red when doing emergency call) was not willing to go to background/get minimized. Sony 10iii/5.0.0.71.

Is this feature, bad luck or user error?