To whom does the الولاء pass if the manumitter leaves no paternal relatives ('Asaba) or heirs?

Primary text

If the manumitter leaves no paternal relatives or heirs, the الولاء passes to the master of the manumitter (Mawla Mawlahu), then to his closest paternal relatives. If the manumitter's lineage, the masters of the manumitters, and their descendants all perish, the estate belongs to the public treasury (Bayt al-Mal). This ruling applies only when the manumitter leaves no direct heirs or paternal relatives, as they would rightfully claim inheritance and liability (Aql) over the master's paternal relatives and children.