SQL Server - db_owner user can't see sys schemas
Ok, i resolved it. Sometimes google first, sorryu for post :)

It was necessary allow Ole Automation Procedures:

    sp_configure 'show advanced options', 1;
GO
RECONFIGURE;
GO
sp_configure 'Ole Automation Procedures', 1;
GO
RECONFIGURE;
GO


And then grant rights to user:

grant exec on schema::sys to [USER]