Downloaded maps no longer working

I have for a long time used Sports Tracker for cycling with an offline Google map of the area with no issues.
In the current version it no longer works sadly. It shows a message line ‘map offline’ on the display and if I go off the map currently cached to screen there is nothing.

I updated maps and re loaded the map of the area. I even thought maybe the very old phone I used as a bike computer was now too old so I moved onto a spare Samsung S7 but its still the same.
I particularly use sports tracker for this ability as I can have mobile data off and use a cheap SIM for emergency calls only.
The app seems to only be fetching maps data direct from the net now and ignoring offline maps.

I since tried putting offline open maps on too but setting the app to openmaps it still only uses online maps

For now I have added a minimal data bundle onto the SIM in my ‘bike phone’ as data use on maps is pretty low, 17MB last bike ride.