Local temp table created inside stored procedure does not drop automatically at the end of current session

Here I just want to play with local temp table behavior inside a stored procedure. I still create and drop temp table inside the same proc.

Below is the sample proc:

/*********************************************/

CREATE PROCEDURE dbo.test2

AS
/*
exec dbo.test2
*/
begin
begin try
    CREATE TABLE #test2(test2 int)

return
end try
begin catch
    select 'This is inside CATCH statement of proc test2!'
return
end catch
end
GO

/*********************************************/

After I close the query window that runs "exec dbo.test2" and the conn session is supposed to be closed(?). When I open another query window and run the query below:

select * from tempdb.sys.columns 
where name in ('test2')

I still see this record there, which means the temp table still exists after the session is closed(?). This column is unique for sure.

Any explanation here?

Thanks.

Shigui,