TeamCity sometimes publish *war artifacts without libraries inside

Hi.

I have buildplan which builds *war artifact. I have configured artifact publishing as

my-app/target/my-app*.war

Sometimes I see artifact with proper size, but sometimes the size is less than usual. The reason is missing libraries in WEB-INF/lib folder.

There is no any configuration changes. I can run two or three builds one after another and first artifact will be normal while second is not.

What goes wrong?