Expected behavior: when creating a zoomed map, the resulting map will have the original map's explored area already filled in.
Actual behavior: the zoomed map is blank, with only the player's small surrounding bubble filled in.
I believe this is new behavior with 1.5.1 or possibly 1.5.0 because I had a 3/4 map created under 1.4 that I tried to expand last night under 1.5.1 and only now did I notice this behavior.
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This also appears to reset explored Ocean Explorer maps that were in the area of the zoomed regular map. Here's the sequence of events for me:
1) Buy Ocean Explorer map
2) Travel to the indicated location and explore the area, including completely mapping the location of the ocean monument (did not actually go into the monument however)
2a) A portion of the 3/4 zoom regular map was filled in, of course, as I explored the area
3) Back at base, zoom the 3/4 regular map to 4/4 and lose all explored areas as indicated in the original bug description
4) Pick up the ocean explorer map - all areas are back to "unexplored" colors/textures, like I had never been there
5) Buy a 2nd ocean explorer map from the same villager - it is the exact same map (as expected), and also completely unexplored as though I had never been in the area
It certainly seems that the game is completely "unexploring" areas when you zoom maps. I guess mapmaking/zooming is more closely tied than I expected to whatever data structure holds "explored chunks". The game legit thinks I never explored those areas.