Lava
Auto-translated
I want to give some advice for the future.
When creating a map, I make a lot of intermediate saves. The number of them is several dozen.
Do the same.
Intermediate maps can have names like these: Good to go 2a, Good to 2b, Good to go 2c, Good to go 3c, and so on until the map is finished.
Map files have a small size, which is very beneficial.