[Rendering] Problem when expanding the adaptive card by the insert fields from several objects.

Target Platforms

UWP

SDK Version

AdaptiveCards.Templating, Version=2.6.0.0

Application Name

Microsoft Teams

Problem Description

Hello!

I faced a problem when expanding the adaptive card by the insert fields from several objects - the collection insert field is breaking when the data source is in the second object.

For example, let firstProp insert field value will be in the Model1, and properties insert field value will be in the Model2:

public class Model1
{
     public string FirstProp { get; set; }
}

public class Model2
{
     public ICollection<KeyValuePair<string, string>> Properties { get; set; }
}

And then I extend this card by these models something like this:

var template = new AdaptiveCardTemplate(jsonTemplate);
var card = template.Expand(new Model1 { FirstProp = "FirstPropValue" });
template = new AdaptiveCardTemplate(card);
card = template.Expand(new Model2
{
    Properties = new[]
    {
        new KeyValuePair<string, string>("key1", "value1"),
        new KeyValuePair<string, string>("key2", "value2")
    }
});

Then I get Failed result.
But if I expand at first Model2 and then Model1 I get Success result.
And it's working incorrectly not only with collection but with several embedded functions in adaptive cards, like joining of collection of strings.

Right now I'm workaround it by merging all insert fields source objects in JObject, kind of this:

public string BuildCard(string jsonTemplate, params object[] properties)
{
	var mergedProperties = JObject.FromObject(properties.First());
	foreach (var property in properties.Skip(1).ToList())
	{
		mergedProperties.Merge(property);
	}

	var template = new AdaptiveCardTemplate(jsonTemplate);
	
	return template.Expand(mergedProperties);
}

But still, it looks like a bug.

Thank you.
Best regards.

Screenshots

Failed result

Success result

Card JSON

{
    "type": "AdaptiveCard",
    "$schema": "http://adaptivecards.io/schemas/adaptive-card.json",
    "version": "1.4",
    "body": [
        {
            "type": "TextBlock",
            "text": "${firstProp}",
            "wrap": true
        },
        {
            "$data": "${properties}",
            "type": "TextBlock",
            "text": "${key}: ${value}",
            "wrap": true
        }
    ]
}

Sample Code Language

No response

Sample Code

No response

Start with the AdaptiveCardTemplate Expand entry point and reproduce the sequential expansion using Model1 followed by Model2 from the issue. Trace how collection insertion and embedded functions resolve data across expansions; done means the Model1-then-Model2 order succeeds, including the properties collection and joined string collections.