Is the disposition (tadbīr) and bequest (waṣiyyah) of an individual placed under legal incapacitation due to foolishness (mahjūr 'alayhi li-sufh) valid?

Primary text

The disposition of property upon death (tadbīr) and the bequest (waṣiyyah) of a person placed under guardianship due to foolishness (sufh) are valid. This validity is established by the analogy drawn to the rulings concerning a minor who has reached the age of discretion.