When saving a map, data is lost.

No. Everything is correct; I managed to get out of this (I focused and put on my glasses)... The only thing preventing me from loading the game is the presence of Russian characters in the path to the map, like D:\Игры\Heroes 5. It shouldn't be like that; it should be, for example, D:\Games\Heroes 5, and then the problem will be solved (at least for me).