fix: ensure guild

Author: Lulalaby

DisCatSharp/Clients/DiscordClient.Dispatch.cs

@@ -2798,7 +2798,7 @@ internal async Task OnGuildRoleCreateEventAsync(DiscordRole role, DiscordGuild g
 	internal async Task OnGuildRoleUpdateEventAsync(DiscordRole role, DiscordGuild guild)
 	{
 		var newRole = guild.GetRole(role.Id);
-		var oldRole = CreateRoleSnapshot(newRole ?? role, guild);
+		var oldRole = this.CreateRoleSnapshot(newRole ?? role, guild);
 
 		if (newRole is null)
 		{

DisCatSharp/Entities/Channel/DiscordChannel.cs

@@ -145,7 +145,7 @@ public bool IsStage
 	/// </summary>
 	[JsonIgnore]
 	public DiscordGuild? Guild
-		=> this.GuildId.HasValue && this.Discord.Guilds.TryGetValue(this.GuildId.Value, out var guild) ? guild : null;
+		=> this.GuildId.HasValue ? this.Discord is DiscordClient client && client.GuildsInternal.TryGetValue(this.GuildId.Value, out var guild) ? guild : this.Discord.Guilds.TryGetValue(this.GuildId.Value, out guild) ? guild : null : null;
 
 	/// <summary>
 	///     Gets a collection of permission overwrites for this channel.