After updating the MapPress Pro 2.42.1 to MapPress 2.50.8; and resolving a crash by changing a call from Mappress_Map::get_post_map_list(get_the_ID());
all the maps in the existing posts in our site no longer display.
The actual map doesn’t show in edit mode either. What shows is an option to create a new map.
I’ve verified that the underlying data for the map and post exists.
What is the recommended way of updating from 2.42.1 to 2.50.8?