I filled a 1:4 map and upgraded it to a 1:8 map to explore more area, but the 1:8 map did not have the same info (map recording) as the 1:4 map, as if it was never recorded or it was a brand new map. The pictures i have are not what happened to me the first time, but it is an perfect demonstration for what happened. I am hoping this is resolved in 1.14.2.