What happened to my test project?

https://preview.redd.it/b6qajkthnbf51.png?width=1118&format=png&auto=webp&s=562f1bc35f6b43e8d19f20cc7f13713e88002505

it already happened 2 times, the mesh becomes invincible. Is the file corrupted? can I recover the file? (UE4.25)