The congregational rules are:
• A follower performs Sujud al-Sahw for the prayer leader's forgetfulness, even though the follower personally made no mistake.
• The follower does not perform a separate Sujud al-Sahw merely for the follower's own mistake while following.
• A Masbuq follows the prayer leader in Sujud al-Sahw and then completes the missed rak'ahs. If the Masbuq then makes a new forgetful Wajib error while completing alone, another Sujud al-Sahw is performed at the end.
• A Lahiq does not perform a separate Sujud al-Sahw for an error occurring in the portion being completed under the source's rule.
These categories should not be collapsed into one generic 'latecomer' rule.