Get callTranscript Content does not work in SDK

Describe the bug

I am trying to download transcripts and recordings using Microsoft.Identity.Web.GraphServiceClient 2.18.1. The docs ?? say this:

// Code snippets are only available for the latest version. Current version is 5.x

// To initialize your graphClient, see https://learn.microsoft.com/en-us/graph/sdks/create-client?from=snippets&tabs=csharp
await graphClient.Users["{user-id}"].OnlineMeetings["{onlineMeeting-id}"].Transcripts["{callTranscript-id}"].Content.GetAsync();

Which should return a Task<Stream> according to Intellisense. When I run this code, I get the following exception, Invalid format 'application/octet-stream, application/json' specified. with a 400 response code. If I remove .Content. I do get the transcript information.

Expected behavior

I would expect a stream to be returned with a 200 response. application/octet-stream would seem to be the correct content type for that.

How to reproduce

n/a

SDK Version

2.18.1

Latest version known to work for scenario above?

No response

Known Workarounds

I can download the transcript via postman if I specify the $format=text/vtt query parameter. Can't find a work-around within the SDK.

Debug output

</details>


### Configuration

- OS: Windows 11  x64

### Other information

_No response_

Start with ContentRequestBuilder.GetAsync in the Microsoft Graph .NET SDK 2.18.1 and review the request sent for the transcript content endpoint. Compare it with the successful Postman request using $format=text/vtt and the reported application/octet-stream, application/json error. Done means the SDK request returns the transcript stream with a 200 response.