Replicating tables that have fields with the default value sysdate

Hi

We have two tables between which replication is configured GoldenGate 19c. On the source side, the table has a "mod_date" field with a default value Sysdate and this field have parameter NULL=n, null values are not allowed. On the target side, a similar table is created, but for the same field, the default Sysdate is not set and the have parameter NULL=y, null values allowed

When on the source side, row are updated, but the "mod_date" field data not provided, and since it has a value Sysdate as default for field, the current date is substituted. However, this current date is not transmitted to the target DB, but only those field values ​​that actually had some value. And it turns out that the "mod_date" field on the source DB is updated, and on the target DB the old unchanged value.