Redshift copy command not getting default value

I have a file in S3 with the following format:

col1,col2
number1,content1
number2,content2
number3,content3

I am creating a Redshift table with the structure bellow:

CREATE TABLE IF NOT EXISTS general.name.name_test (
   col1 VARCHAR(255),
   col2 VARCHAR(255),
   inserted_timestamp TIMESTAMP DEFAULT GETDATE()
);

After that, I am using Redshift copy command to have the data available in the table I just created:

COPY general.name.name_test
    FROM 's3://.../name_test.txt'
    ACCESS_KEY_ID '' SECRET_ACCESS_KEY '' SESSION_TOKEN ''
    DELIMITER AS ','
    IGNOREHEADER AS 1
csv;

The problem is that "inserted_timestamp" is NULL and Redshift is not taking the default value.

Am I missing something? This is what I will get in Redshift:

col1,col2,inserted_timestamp
number1,content1,null
number2,content2,null
number3,content3,null

It only works if I specify the columns but I wanted to avoid that if possible:

COPY general.name.name_test
    (col1,col2)
    FROM 's3://.../name_test.txt'
    ACCESS_KEY_ID '' SECRET_ACCESS_KEY '' SESSION_TOKEN ''
    DELIMITER AS ','
    IGNOREHEADER AS 1
csv;

Thank you!