After change world to version/snapchot 1.14.2 pre. 3 every frame is gone

Duplicate of MC-154499.

You can restore your world from a backup if you have created one. Don't play in a world that you care about in snapshots or pre-releases.

To late for restore, I fixed everything before I saw your anwser XD
and last restore I made before 1 week and meantime I built a lot of things