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Emulator does not render valid adaptive card in an activity

See original GitHub issue

Version of emulator: 4.9.1

The below activity has a valid adaptive card that renders properly in adaptivecards.io. In emulator it looks like the below. It seems related to having a curly bracest in the string value. If I change it to obj= and remove the trailing curly brace it works fine.

In emulator (wrong):

In adaptive cards designer (right):

Activity:

{
    "type": "message",
    "attachments": [
        {
            "contentType": "application/vnd.microsoft.card.adaptive",
            "content": {
                "type": "AdaptiveCard",
                "version": "1.0",
                "body": [
                    {
                        "type": "TextBlock",
                        "text": "simple",
                        "size": "large"
                    },
                    {
                        "type": "FactSet",
                        "facts": [
                            {
                                "title": "due",
                                "value": "{timex: [2020-06-01], type: date}"
                            }
                        ]
                    }
                ],
                "$schema": "http://adaptivecards.io/schemas/adaptive-card.json"
            }
        }
    ]
}