BRUH I WORKED ON IT SO HARD AND NOW ITS EMPTY FOR NO ####### REASON
i thought first its streaming issue and i right click on the world partition and Load it
BUT i saw in the files its emptyyyy.
When you opened the world partition details is there any region selected and loaded? (Marked as white squares), because I see that there’s the “No regions loaded” warning, to load a region select a white square in the world partition map, right click and select load, maybe that could solve your problem
the warning was always there and i dont even know how to hide it or fix it
i dont think its the problem
here is exactly what i did:
i was making an material for my object and this material is “glass”
so i made the material and its good i Applied and saved and i gone to replace it
so i gone to the map-tab and i saw nothing
and i lost the hope of the humanity in that moment 
and that is the only thing left in the map.
(if the issue will not be fixed in the future, i will make my own game engine, and if anyone will tell me switch to 5.6 its way better, yes its better and yes i dont have enough money to buy the minimum preformence to run that engine)
Look right side, there is outliner. It looks like you hide everything in the outliner, there is a “eye” icon, yours are closed
If this is not the case it looks like you deleted everything 
I suggest you to work with revision control system to go back
yes its like this
but when i click on the eye nothing happen
and the folders already empty
i used to see this eye when the folders are empty or i hide them
but in this photo they are empty
and also
i take it as a sign from god that i need to try again
and this is what i got for now
its way better than the previous map
[sorry about my english, i tried]