When adding first user message Rasa is incorrectly pushing two `action_listen` events to tracker

Rasa version: 1.6.1 Rasa SDK version (if used & relevant):

Rasa X version (if used & relevant):

Python version: 3.6.9 Operating system (windows, osx, …): Ubuntu 19.10 Issue: When adding first user message Rasa is incorrectly pushing two action_listen event to tracker, which results in predicting ActionDefaultFallback instead of proper action defined in conversation. Error occurs when using tracker store different than InMemoryTrackerStore.

Full tracker of that conversation:

{
    "_id" : ObjectId("5e1d829fc0f0571179a05a68"),
    "sender_id" : "internal_6ded90eb-1713-4cc0-bb94-e44f10906aa9",
    "active_form" : {},
    "events" : [ 
        {
            "event" : "action",
            "timestamp" : 1578992287.49245,
            "name" : "action_session_start",
            "policy" : null,
            "confidence" : null
        }, 
        {
            "event" : "session_started",
            "timestamp" : 1578992287.49247
        }, 
        {
            "event" : "action",
            "timestamp" : 1578992287.49251,
            "name" : "action_listen",
            "policy" : null,
            "confidence" : null
        }, 
        {
            "event" : "action",
            "timestamp" : 1578992287.49251,
            "name" : "action_listen",
            "policy" : null,
            "confidence" : null
        }, 
        {
            "event" : "user",
            "timestamp" : 1578992287.49483,
            "text" : "hej",
            "parse_data" : {
                "intent" : {
                    "name" : "greet",
                    "confidence" : 0.9904693961
                },
                "intent_ranking" : [ 
                    {
                        "name" : "greet",
                        "confidence" : 0.9904693961
                    }, 
                    {
                        "name" : "wypowiedzenie_polisy",
                        "confidence" : 0.0028299373
                    }, 
                    {
                        "name" : "lista",
                        "confidence" : 0.0022578358
                    }, 
                    {
                        "name" : "your_name",
                        "confidence" : 0.0019035154
                    }, 
                    {
                        "name" : "intencja_8",
                        "confidence" : 0.0013759891
                    }, 
                    {
                        "name" : "inform",
                        "confidence" : 0.0004938081
                    }, 
                    {
                        "name" : "goodbye",
                        "confidence" : 0.0004290111
                    }, 
                    {
                        "name" : "stop",
                        "confidence" : 0.000240524
                    }
                ],
                "entities" : [],
                "text" : "hej",
                "disablesBot" : false,
                "originalText" : "hej",
                "intentId" : "5d131175239ef4004bae057f"
            },
            "input_channel" : null,
            "message_id" : "e78661e26cc9411f823dbd02d1421caf",
            "metadata" : {}
        }, 
        {
            "event" : "action",
            "timestamp" : 1578992287.79463,
            "name" : "action_default_fallback",
            "policy" : "policy_2_FallbackPolicy",
            "confidence" : 0.3
        }, 
        {
            "event" : "bot",
            "timestamp" : 1578992287.79464,
            "metadata" : {
                "attachments" : []
            },
            "text" : null,
            "data" : {
                "elements" : [],
                "quick_replies" : null,
                "buttons" : null,
                "attachment" : null,
                "image" : null,
                "custom" : null
            }
        }, 
        {
            "event" : "rewind",
            "timestamp" : 1578992287.79464
        }
    ],
    "followup_action" : null,
    "latest_action_name" : "action_listen",
    "latest_event_time" : 1578992287.79464,
    "latest_input_channel" : null,
    "latest_message" : {
        "intent" : {},
        "entities" : [],
        "text" : null,
        "message_id" : null,
        "metadata" : {}
    },
    "paused" : false,
    "slots" : {
        "form_state" : null,
        "imie" : null,
        "nazwisko" : null,
        "requested_slot" : null,
        "system" : null,
        "zonaty" : null
    }
}

[federicotdn]

cc @ricwo this is what I mentioned in the rasa export PR

[federicotdn]

I was able to reproduce this, on master commit 4211b92b029:

To reproduce:

• rasa init --no-prompt
• Modify endpoints.yml
• rasa shell
• Talk to the bot
• Inspect the conversation tracker in tracker.db

My endpoints.yml file:

tracker_store:
  type: sql
  dialect: sqlite
  db: tracker.db