Diff on OneToOne optional false

[louis-neologix]

When I add the attribute optional to false on a OneToOne link :

@OneToOne(optional = false)
private Address address;

The diff changelog contains the following changesets :

databaseChangeLog:
- changeSet:
    id: 1579006019496-2
    author: louis (generated)
    changes:
    - addUniqueConstraint:
        columnNames: address_id
        constraintName: UK_hdhcc7238a2lwr4yjw78qvlof
        tableName: contact
- changeSet:
    id: 1579006019496-1
    author: louis (generated)
    changes:
    - addNotNullConstraint:
        columnDataType: bigint
        columnName: address_id
        tableName: contact

Then, each time I generate the diff change log, it recreates the unique constraint :

databaseChangeLog:
- changeSet:
    id: 1579006765086-1
    author: louis (generated)
    changes:
    - dropUniqueConstraint:
        constraintName: UK_hdhcc7238a2lwr4yjw78qvlof
        tableName: contact
    - addUniqueConstraint:
        columnNames: address_id
        constraintName: UK_hdhcc7238a2lwr4yjw78qvlof
        tableName: contact

If I use the liquidbase diff command, it display the following infos :

Changed Unique Constraint(s): 
     UK_hdhcc7238a2lwr4yjw78qvlof on contact(address_id)
          clustered changed from 'null' to 'false'

Any idea of what cause this behavior ?

Thanks

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