Really funny thing happened today, the new app Geolocation started working for me today at least when I left so I can only imagine that it should work when I arrive.
The only thing I did was open the menu, select Manage Location, then Geolocation, then just selected Done. I also deleted the Mobile Phone/Connect Now presence sensor from the old SmartThings Classic app. I’m not sure if either or the combination of both caused the new SmartThings app phone location presence to start working at least when I left.
Update: Geolocation also worked when I Arrived. So geolocation in the new SmartThings app is once again working for me.