"The Mukatab is free to the extent that the has paid off (toward buying his freedom); he Hadd punishment should be carried out on him proportionate to the amount he has paid off (toward buying his freedom); and he inherits proportionate to the amount he has paid off (toward buying his freedom)." (Using translation from Nasāʾī 4811)
عَنِ النَّبِيِّ ﷺ قَالَ «الْمُكَاتَبُ يَعْتِقُ مِنْهُ بِقَدْرِ مَا أَدَّى وَيُقَامُ عَلَيْهِ الْحَدُّ بِقَدْرِ مَا عُتِقَ مِنْهُ وَيَرِثُ بِقَدْرِ مَا عَتَقَ مِنْهُ»