[Designer] Data binding Issue

Problem Description

Trying to understand how templating works with the new designer (https://adaptivecards.microsoft.com/designer.html) but i am seeing too many console errors

Card JSON

{
    "type": "AdaptiveCard",
    "$schema": "https://adaptivecards.io/schemas/adaptive-card.json",
    "speak":"hello",
    "version": "1.5",
    "body": [
        {
            "type": "TextBlock",
            "text": "${title}",
            "wrap": true
        }
    ]
}

Screenshot

Open the Adaptive Cards designer at the linked URL and reproduce the console errors with the supplied Card JSON, including the ${title} binding. Trace the reported errors to the designer behavior and document or verify the result; done means the reported console errors and their templating context are accounted for.