Any transaction involving the conservatorship estate which is affected by a conflict between the conservator’s fiduciary and personal interests is voidable unless the transaction is expressly authorized by the court after notice to interested persons. A transaction affected by a conflict between personal and fiduciary interests includes any sale, encumbrance, or other transaction involving the conservatorship estate entered into by the conservator, the spouse, descendant, agent, or lawyer of a conservator, or corporation or other enterprise in which the conservator has a beneficial interest.