FOSS gamedev and creative worlds

To be more detailed, here's the deal:
I run minetest. Enter a world. I play around for a bit, then exit. After that, all the changes I made are gone, chests (if I have succesfully placed any and they weren't erased by the bug) have the previously saved state (I had in there a pickaxe and some stone. I take out the stone and pickaxe and put sand in there. I exit the world, I enter back - chest has pick and stone, my inventory has pick and stone, but no sand!). Only inventory is saved.

some screens, this is the same place, same coordinates, in same world, but newly created. I created it, entered, dig some sand, exit, enter back and I'm no longer in the desert, I'm in solid stone. And so on.

If someone runs into this as well/again: delete map_meta or check minetest.conf for server_map_save_interval. Good Luck.

This problem need to be fixed; its keep on happening to me (without any warning). Its very annoying when i open my world to find that everything has gone. (However when i remove the "map_meta.txt" it fixes the problem for a while)
Is they any way to stop this problem so that it never dose it again.