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From https://neo4j.com/docs/bolt/current/bolt-compatibility/ it seems neo4j 5 still speaks bolt 4.0, I think you could give it a try.

Yes but that is the bolt protocol, the driver version 4.0.1 is only supported in neo4j 4.x: https://neo4j.com/developer/kb/neo4j-supported-versions/

Ok, the issue was created here for requesting it, it's more than welcome to share more information there https://github.com/vesoft-inc/nebula-exchange/issues/150 🙂