Problems with (C#) models from PayPal Orders OpenAPI

[MihaMarkic]

Here is the PayPal Orders v2 API which I'm trying to generate code for.

Pay attention to Orders schema, which looks something like:

     "order": {
        "type": "object",
        "title": "Order",
        "description": "The order details.",
        "allOf": [
          {
            "$ref": "#/components/schemas/activity_timestamps"
          },
          {
            "properties": {
              "id": {
                "type": "string",
                "description": "The ID of the order.",
                "readOnly": true
              },
              ...

The problem I'm facing is that the Order model doesn't contain any property at all, though it is (probably correctly) a subclass of activity_timestamps.

Generated code:

public class Order : Activity_timestamps, IParsable 
{
    /// <summary>
    /// Creates a new instance of the appropriate class based on discriminator value
    /// </summary>
    /// <returns>A <see cref="Order"/></returns>
    /// <param name="parseNode">The parse node to use to read the discriminator value and create the object</param>
    public static new Order CreateFromDiscriminatorValue(IParseNode parseNode)
    {
        _ = parseNode ?? throw new ArgumentNullException(nameof(parseNode));
        return new Order();
    }
    /// <summary>
    /// The deserialization information for the current model
    /// </summary>
    /// <returns>A IDictionary&lt;string, Action&lt;IParseNode&gt;&gt;</returns>
    public override IDictionary<string, Action<IParseNode>> GetFieldDeserializers()
    {
        return new Dictionary<string, Action<IParseNode>>(base.GetFieldDeserializers())
        {
        };
    }
    /// <summary>
    /// Serializes information the current object
    /// </summary>
    /// <param name="writer">Serialization writer to use to serialize this model</param>
    public override void Serialize(ISerializationWriter writer)
    {
        _ = writer ?? throw new ArgumentNullException(nameof(writer));
        base.Serialize(writer);
    }
}

[MihaMarkic]

Looks like that #4346 is a similar issue

[MihaMarkic]

Looks like the solution from #4346 works - moving properties out of 'allOf' array to sibling position to allOf fixes it. Code then seems properly generated.
Like

...
"properties: { ... },
"allOf": [{ "$ref": "#/components/schemas/activity_timestamps"}]
...

[baywet]

Thanks for reaching out and for the detailed analysis. Since this looks extremely similar to the other issue, and since a fix is already in progress, I'm going to go ahead and close it as duplicate. Please follow the other issue to get updates.