Updating the element templates with camunda:Connector leads to duplicated <camunda:connector> element in XML

Describe the bug

Given one template on my local machine

When I make a change to it i.e. increase the version number The upgrade is correctly suggested in the UI. ✔️

When upgrade to the newer version Then the one camunda:connector element in the XML is not replaced, but it is duplicated. ❌

Steps to reproduce

1. Create a new template in your element-template folder in your Camunda Desktop Modeler installation with the following content:

This is the same template example provided here that uses the Camunda 7 Connectors. See docs here and here

{
  "$schema": "https://unpkg.com/@camunda/element-templates-json-schema/resources/schema.json",
  "name": "ConnectorGetTask-LOCAL",
  "id": "9a158cf8-c500-40d8-90a5-c4a62727684110",
  "appliesTo": [
    "bpmn:Task"
  ],
  "version": 1,
  "properties": [],
  "scopes": [
    {
      "type": "camunda:Connector",
      "properties": [
        {
          "label": "ConnectorId",
          "type": "String",
          "value": "My Connector HTTP - GET",
          "binding": {
            "type": "property",
            "name": "connectorId"
          }
        },
        {
          "label": "Method",
          "type": "String",
          "value": "GET",
          "binding": {
            "type": "camunda:inputParameter",
            "name": "method"
          }
        },
        {
          "label": "URL",
          "type": "String",
          "value": "https://bpmn.io",
          "binding": {
            "type": "camunda:inputParameter",
            "name": "url"
          }
        },
        {
          "label": "Response",
          "type": "String",
          "value": "wsResponse",
          "binding": {
            "type": "camunda:outputParameter",
            "source": "${S(response)}",
            "scriptFormat": "freemarker"
          }
        }
      ]
    }
  ]
}

1. Create a new C7 BPMN diagram and add a task to it

2. Apply the template to the task and save

3. Increase the version number in the template from 1 to 2

4. Go to your diagram from (3.) and Upgrade the template

5. Open the XML view and see two entries of camunda:connector in the XML

See screen recording:

https://user-images.githubusercontent.com/25924333/192004921-64472a7e-0147-4a23-82f9-e49a746341ff.mov

And the only difference between the two templates is the version:

Expected behavior

The upgrade of the template should replace my cammunda:Connector, not duplicate it.

Environment

• OS: all
• Camunda Modeler Versions : tested in v4.12.0 and v5.3.0
• Execution Platform: Camunda Platform 7
• Installed plug-ins: Cawemo Cloud Connect Plugin

Additional context

The issue has been reported by a customer via SUPPORT-14645

[nikku]

Low effort to patch release this. We have an existing process + branching strategy in place.

[sghidiu]

Hi Team, customer has migrated their plugins to V5.x now. Is it possible to get a timeline for a fix on V5?