port the fix to storing json in telegram channel to 1.3.x

CHANGELOG.rst

@@ -18,6 +18,7 @@ Fixed
 - Default one-hot representation for label featurization inside ``EmbeddingIntentClassifier`` if label features don't exist.
 - Policy ensemble no longer incorrectly wrings "missing mapping policy" when
   mapping policy is present.
+- "test" from ``utter_custom_json`` now correctly saved to tracker when using telegram channel
 
 Removed
 -------

rasa/core/channels/telegram.py

@@ -1,4 +1,5 @@
 import logging
+from copy import deepcopy
 from sanic import Blueprint, response
 from sanic.request import Request
 from telegram import (
@@ -94,6 +95,8 @@ async def send_text_with_buttons(
     async def send_custom_json(
         self, recipient_id: Text, json_message: Dict[Text, Any], **kwargs: Any
     ) -> None:
+        json_message = deepcopy(json_message)
+
         recipient_id = json_message.pop("chat_id", recipient_id)
 
         send_functions = {