Rasa App executePostMessageSent returning null

Hello ppl, I'm having a problem trying to integrate my Rasa bot with RC. While I already set up the Omnichannel (Department and Routing) and installed RasaApp from the marketplace.

RasaApp logs

Instance: c81df0d9-6852-4430-9513-6eac8eefaf31
debug: 2023-07-12T07:48:59.076Z Caller: anonymous OR constructor
[
  "executePostMessageSent is being called..."
]
debug: 2023-07-12T07:48:59.081Z Caller: anonymous OR constructor
[
  "'executePostMessageSent' was successfully called! The result is:",
  null
]

Rasa Server

Rasa Version      :         3.6.2
Minimum Compatible Version: 3.5.0
Rasa SDK Version  :         3.6.0
Python Version    :         3.8.0

RocketChat

Version:                     6.2.0
Apps Engine Version:         1.39.0
Node Version:                v14.21.3
Database Migration:          294 (July 10, 2023 10:04 AM)
MongoDB:                     5.0.18 / wiredTiger (oplog Enabled)

For Test: Using the outgoing webhook bot is working fine with RC. but getting multiple responses message from Rasa.

PS. The bot is working fine with Slack+RASA, with no any issue or multiple responses

@murtaza98 maybe you can help again?

RocketChat / Apps.Rasa

Rasa App executePostMessageSent returning null #43