What is the ruling if two partners in a slave stipulate contradictory conditions regarding the slave's freedom based on the slave being a crow (ghurab)?

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If one partner stipulates, 'If this bird is a crow, my share is free,' and the other stipulates, 'If it is not a crow, my share is free,' and the bird flies away unknown to them, the entire slave is freed if both partners are financially solvent (muserin). If one is solvent and the other is not (mu'sir), only the share of the insolvent one is freed. If both are insolvent, neither share is freed because the condition for manumission (hanth) has not been determined. If one partner buys the other's share, half the slave becomes free because half is certainly free, and the freedom does not extend to the other half. If a non-partner buys the slave, half is freed because half is certainly free, and the buyer does not own the entirety.