I'm glad that you managed to reproduce it in the Gremlin Console. But I believe that in fact you do it with two JanusGraph servers, not with a single server as you assumed. As far as I understand janusgraph.sh in step 1 and gremlin-server.sh in step 2 are both starting a JanusGraph instance. So I think your test scenario is close to multi-node configuration. That's why a single node test you mentioned could not catch this issue. For single node it works fine.
