IWICImagingFactory2 appears to change ApartmentState (AOT)

[shinta0806]

When I create an instance of IWICImagingFactory2, the ApartmentState appears to change from MTA to STA.

String? a = null;
String? b = null;
await Task.Run(() =>
{
	a = Thread.CurrentThread.GetApartmentState() + ", " + PInvoke.GetCurrentThreadId();
	IWICImagingFactory2 factory2 = new();
	b = Thread.CurrentThread.GetApartmentState() + ", " + PInvoke.GetCurrentThreadId();
});
await App.MainWindow.ShowMessageDialogAsync(a + "\n" + b);

MTA, 18716
STA, 18716

This phenomenon occurs when AOT is configured but not published (i.e., it is not actually AOT).

What's strange is that this phenomenon does not occur when publishing with AOT or when AOT is not configured.

Why has this situation come about?

My environment is:

• Windows 11 25H2
• Visual Studio 2026 18.0.1
• .NET 10
• Windows App SDK 1.8.251106002
• Vortice.Direct2D1 3.6.2

<PropertyGroup>
	<OutputType>WinExe</OutputType>
	<TargetFramework>net10.0-windows10.0.19041.0</TargetFramework>
	<TargetPlatformMinVersion>10.0.17763.0</TargetPlatformMinVersion>
	<RootNamespace>TestAOT4</RootNamespace>
	<ApplicationIcon>Assets/WindowIcon.ico</ApplicationIcon>
	<ApplicationManifest>app.manifest</ApplicationManifest>
	<Platforms>x64</Platforms>
	<RuntimeIdentifiers>win-x64</RuntimeIdentifiers>
	<PublishProfile>Properties\PublishProfiles\win10-$(Platform).pubxml</PublishProfile>
	<ImplicitUsings>enable</ImplicitUsings>
	<Nullable>enable</Nullable>
	<UseWinUI>true</UseWinUI>
	<EnableMsixTooling>true</EnableMsixTooling>
	<WindowsAppSDKSelfContained>true</WindowsAppSDKSelfContained>
	<PublishAot>True</PublishAot>
	<IsAotCompatible>true</IsAotCompatible>
	<SuppressTrimAnalysisWarnings>false</SuppressTrimAnalysisWarnings>
	<TrimmerSingleWarn>false</TrimmerSingleWarn>
	<TrimMode>partial</TrimMode>
	<SupportedOSPlatformVersion>10.0.19041.0</SupportedOSPlatformVersion>
	<AppxPackageSigningEnabled>True</AppxPackageSigningEnabled>
	<GenerateAppInstallerFile>True</GenerateAppInstallerFile>
	<AppxPackageSigningTimestampDigestAlgorithm>SHA256</AppxPackageSigningTimestampDigestAlgorithm>
	<AppxAutoIncrementPackageRevision>True</AppxAutoIncrementPackageRevision>
	<GenerateTestArtifacts>True</GenerateTestArtifacts>
	<AppxBundle>Never</AppxBundle>
</PropertyGroup>

[shinta0806]

This issue does not occur if we call
Thread.CurrentThread.SetApartmentState(ApartmentState.MTA);
beforehand.

Even in the case of an implicit MTA (APTTYPEQUALIFIER_IMPLICIT_MTA), I think it's better not to change to STA when generating IWICImagingFactory2.