[Bug]: Calling ChannelExtensions.GetChannelType on SocketForumChannel returns null

[lapin-b]

Check The Docs

• I double checked the docs and couldn't find any useful information.

Verify Issue Source

• I verified the issue was caused by Discord.Net.

Check your intents

• I double checked that I have the required intents.

Description

Everything is in the title.

Calling ChannelExtensions.GetChannelType on SocketForumChannel returns null instead of ChannelType.Forum.

While I'm well aware that this method can return null because of the type annotation, I find strange that it doesn't handle the case of a SocketForumChannel.

Version

3.8.1

Working Version

No response

Logs

Stack trace from the sample code:

System.InvalidOperationException: Nullable object must have a value.
   at System.Nullable`1.get_Value()
   at bot.Modules.SynchronizationModule.ReadyHandler() in /home/l4p1n/Code/CLI/discord-bot/bot/Modules/SynchronizationModule.cs:line 38

The channel type the code crashes on is SocketForumChannel. Its contents is irrelevant for this report.

Sample

// Note: The prerequisite code to initialize a client has been cut out

// Replace zero with a real, existing forum channel ID.
ulong forumChannelId = 0;
// _client is a DiscordSocketClient
var forumChannel = _client.GetChannel(forumChannelId) as SocketForumChannel;
Console.WriteLine(
    $"Channel type number of channel ID {forumChannel.Name} " +
    $"is {(int)forumChannel.GetChannelType()}"
);

// The snippet throws an exception with a stack trace similar to the
// one provided in the "Logs" section

Packages

Not relevant. I can fill that in if requested.