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    Type:Bug 
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    Resolution: Duplicate
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    Priority:Major - P3 
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    Affects Version/s: 4.0.5
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    Component/s: JSON
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The condition in visitUUIDConstructor is always true and make it return a UUID_LEGACY regardless of the uuidConstructorName
{{        BsonBinarySubType subType = BsonBinarySubType.UUID_STANDARD;
        if (!"UUID".equals(uuidConstructorName) || !"GUID".equals(uuidConstructorName)) {
            subType = BsonBinarySubType.UUID_LEGACY;
        }}}
{{}}
Fix: https://github.com/mongodb/mongo-java-driver/pull/556
This is not present in 4.1.x as Legacy support has been dropped.