Reproducing issue with orientdb-groovy

TestCase.groovy

@OrientDocument
@CompileStatic
class Process {
    String name
    ProcessNode startNode
    ProcessNode endNode
    Set<Tag> tags

    static mapping = {
        tags(type: OType.EMBEDDEDLIST)
    }
}

@Vertex
@CompileStatic
class ProcessNode {
    String name
}

@Vertex
@CompileStatic
class Tag {
    String title
}

class TestSpec extends Specification {
    @Shared
    OrientGraphFactory factory

    @Shared
    ODatabaseDocumentTx db

    def setup() {
        factory = new OrientGraphFactory('memory:test', 'admin', 'admin')
        db = factory.getDatabase()
        if (!db.exists()) {
            db.create()
        }
    }

    def cleanup() {
        factory.close()
    }

    def 'test entity persistence'() {
        given: 'persist entities'
        def processes = []
        10.times {
            processes << new Process(name: "Simple Name ${it}")
        }
        when: 'commit'
        db.begin()
            processes*.save()
        db.commit()
        then: 'query database with extension method transaction'
        processes.clear()
        factory.withTransaction { graph ->
            processes = Process.executeQuery('select from Process')
        }
        expect:
        processes.size() == 10
        processes[0].name == 'Simple Name 0'
        processes[1].name == 'Simple Name 1'
        processes[2].name == 'Simple Name 2'
        processes[3].name == 'Simple Name 3'
        processes[4].name == 'Simple Name 4'
        processes[5].name == 'Simple Name 5'
        processes[6].name == 'Simple Name 6'
        processes[7].name == 'Simple Name 7'
        processes[8].name == 'Simple Name 8'
        processes[9].name == 'Simple Name 9'
    }
}