Since 2.2 does not have a quiz overduehandling setting, 2.2 course backups do not contain the setting. When restoring a 2.2 course backup into a 2.4 instance, the restore process should apply the site-level default for the overduehandling setting, but it does not. Instead, it always leaves it at the database default, which is to abandon late submissions.
I will attach a patch shortly.