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Summary

When using
interactionEvent.Interaction.CreateResponseAsync(InteractionResponseType.DeferredChannelMessageWithSource)

and then trying to edit via the webookBuilder and adding mentions, I get the error:
Bad request 400

Inner exception:
"{\r\n "allowed_mentions": {\r\n "_errors": [\r\n {\r\n "code": "MODEL_TYPE_CONVERT",\r\n "message": "Only dictionaries may be used in a ModelType"\r\n }\r\n ]\r\n }\r\n}"

Details

Environment: VS2022
Framework: .NET 4.7.2
DSharpPlus Version: 4.3.0-nightly-01143
OS: Windows 11

• Create a message with a button to interact
• Create a method inteeracting with the button and use:
  interactionEvent.Interaction.CreateResponseAsync(InteractionResponseType.DeferredChannelMessageWithSource)
• Then create a WeebHookBuilder and add a RoleMention + some content to respond.

try
{
interactionEvent.Interaction.CreateResponseAsync(InteractionResponseType.DeferredChannelMessageWithSource).Wait();
Thred.Sleep(10000);  //some operation happening

DiscordWebhookBuilder webhook = new DiscordWebhookBuilder();

                            DiscordRole role = interactionEvent.Interaction.Guild.GetRole(YOURROLEID);
                            webhook.AddMention(new RoleMention(role));
                            webhook.WithContent("Hello its me");
                            interactionEvent.Interaction.EditOriginalResponseAsync(webhook).Wait();
}
catch (Exception ex)
{
console.writelIne(ex.toString());
}

Steps to reproduce

1. Click the button you created
2. Wait for the error