[BUG] GetConfigurationSettings(SettingSelector) does not set the ContentType property

[ie-zero]

Library name and version

Azure.Data.AppConfiguration 1.2.0

Describe the bug

The GetConfigurationSettings(SettingSelector) does not set the ContentType property i.e. it returns null when the Fields on the SettingSelector is set.

Example

var selector = new SettingSelector
{
      KeyFilter = "Operations:FuncApps:Usage:Settings:TestKeyVaultReference",
      LabelFilter = string.Empty,

      // SettingFields.ContentType will return null 
      //Fields = SettingFields.Key | SettingFields.Value | SettingFields.Label | SettingFields.ContentType

      // Works fine
      Fields = SettingFields.All
};

Expected behavior

The ContentType property is populated when the Fields = ... | SettingFields.ContentType

Actual behavior

The ContentType property is null

Reproduction Steps

1. Create a App Configuration with URI abc.azconfig.io
2. Create a KeyVault reference with key "Settings:TestKeyVaultReference" via Azure Portal to a KeyVault secret
3. Grant access to the accessing use on both App configuration and KeyVault secret.
4. Execute the following console app

using Azure.Data.AppConfiguration;
using Azure.Identity;

namespace TestSecretRetrieval;

public sealed  class Program
{
    public static void Main()
    {
        var client = new ConfigurationClient(new Uri("https://abc.azconfig.io"), new DefaultAzureCredential());

        var selector = new SettingSelector
        {
            KeyFilter = "Settings:TestKeyVaultReference",
            LabelFilter = string.Empty,

            // SettingFields.ContentType will return null 
            //Fields = SettingFields.Key | SettingFields.Value | SettingFields.Label | SettingFields.ContentType

            // Works fine
            Fields = SettingFields.All
        };
        var settings = client.GetConfigurationSettings(selector);

        // The 'Settings:TestKeyVaultReference' is a valid KeyVault reference and the account which is executed
        //  has access to retrieve the secret.

        foreach (var setting in settings)
        {
            // SettingFields.Key, SettingFields.Value and SettingFields.Label appear to work as expected.
            // The SettingFields.ContentType returns null unless SettingFields.All is specified.

            Console.WriteLine($"{SettingFields.ContentType} = '{setting.ContentType ?? "(null)"}'");
        }
    }
}

Environment

Project is running on .NET 6.0

.NET SDK (reflecting any global.json):
Version: 6.0.410
Commit: 28c7c894a3

Runtime Environment:
OS Name: Windows
OS Version: 10.0.19044
OS Platform: Windows
RID: win10-x64
Base Path: C:\Program Files\dotnet\sdk\6.0.410\

Host:
Version: 7.0.7
Architecture: x64
Commit: 5b20af47d9

.NET SDKs installed:
3.1.426 [C:\Program Files\dotnet\sdk]
6.0.402 [C:\Program Files\dotnet\sdk]
6.0.410 [C:\Program Files\dotnet\sdk]
7.0.100 [C:\Program Files\dotnet\sdk]
7.0.203 [C:\Program Files\dotnet\sdk]

.NET runtimes installed:
Microsoft.AspNetCore.App 3.1.31 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
Microsoft.AspNetCore.App 3.1.32 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
Microsoft.AspNetCore.App 6.0.10 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
Microsoft.AspNetCore.App 6.0.11 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
Microsoft.AspNetCore.App 6.0.18 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
Microsoft.AspNetCore.App 7.0.0 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
Microsoft.AspNetCore.App 7.0.5 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
Microsoft.NETCore.App 3.1.31 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
Microsoft.NETCore.App 3.1.32 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
Microsoft.NETCore.App 6.0.10 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
Microsoft.NETCore.App 6.0.11 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
Microsoft.NETCore.App 6.0.18 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
Microsoft.NETCore.App 7.0.0 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
Microsoft.NETCore.App 7.0.5 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
Microsoft.NETCore.App 7.0.7 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
Microsoft.WindowsDesktop.App 3.1.31 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
Microsoft.WindowsDesktop.App 3.1.32 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
Microsoft.WindowsDesktop.App 6.0.10 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
Microsoft.WindowsDesktop.App 6.0.11 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
Microsoft.WindowsDesktop.App 6.0.18 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
Microsoft.WindowsDesktop.App 7.0.0 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
Microsoft.WindowsDesktop.App 7.0.5 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]

[pallavit]

Thank you for your feedback. Tagging and routing to the team member best able to assist.
/cc: @ShivangiReja , @jsquire

[kinelski]

@ie-zero Thank you for reporting this bug. We were able to identify the cause and it has been fixed
(#38917). The fix will be available in our next beta release (1.3.0-beta.3) which is expected to be out in October.

Closing this since the issue has been addressed.

[ie-zero]

Thank you for addressing this issue.