Failed to save chunk after upgrading to 1.18-pre1

I tried to play the latest snapshot .

The launcher loaded 1.18-pre1.

As directed by the loader I tried to save the world I was playing .

Received 5  "ambiguity between arguments " (this is happens every time!)

After loading arguments received 1 error:

Failed to save chunk 10,13

...>

Server overloaded.

Mismatch in destroy block pos: ........( 18 times)

Later on received same error for Chunk  45,104