.Net: Bug: GettingStartedWithAgents Step09_Assistant_Vision fails with "only messages with 'type=text' are supported currently

[MSDNAndi]

Describe the bug
Running the Step09_Assistant_Vision encounters an error.
(I verified that it is configured with a gpt4-o model.)

To Reproduce
Steps to reproduce the behavior:

1. Load project
2. configure secrets
3. run test
   Expected behavior
   Test should complete without error.

Screenshots
If applicable, add screenshots to help explain your problem.

Platform

• OS: Windows
• IDE: Visual Studio 2022
• Language: C#
• Source: main branch

Additional context
Add any other context about the problem here.

 GettingStarted.Step09_Assistant_Vision.UseSingleAssistantAgentAsync
 Source: Step09_Assistant_Vision.cs line 20
 Duration: 3.7 min

Message: 
System.ClientModel.ClientResultException : HTTP 400 (invalid_request_error: invalid_type)
Parameter: content

Invalid message content: only messages with 'type=text' are supported currently.

Stack Trace: 
ClientPipelineExtensions.ProcessMessageAsync(ClientPipeline pipeline, PipelineMessage message, RequestOptions options)
AzureAssistantClient.CreateMessageAsync(String threadId, BinaryContent content, RequestOptions options)
AssistantClient.CreateMessageAsync(String threadId, MessageRole role, IEnumerable`1 content, MessageCreationOptions options, CancellationToken cancellationToken)
AssistantThreadActions.CreateMessageAsync(AssistantClient client, String threadId, ChatMessageContent message, CancellationToken cancellationToken) line 93
<g__InvokeAgentAsync|0>d.MoveNext() line 60
--- End of stack trace from previous location ---
Step09_Assistant_Vision.UseSingleAssistantAgentAsync() line 45
Step09_Assistant_Vision.UseSingleAssistantAgentAsync() line 55
Step09_Assistant_Vision.UseSingleAssistantAgentAsync() line 55
--- End of stack trace from previous location ---