The Durability doesn't work pillagers crossbow.When they shooting arrows the durability doesn't damage.It should breaks when the crossbow's durability reaches to zero then it will break but it doesn't work bedrock it keeps shooting arrows forever.it doesn't stop.it's works in java.i don't know this java parity or not.
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Thank you for your report!
We're actually already tracking this issue at MCPE-67489, so I will resolve and link this ticket as a duplicate.
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the devs could add this, as this is a java exclusive