Describe the bug

I've added the HandyControls with and 's' at the end, version 3.4.4 to my Project.
It works fine if I use the "old method when adding the code to App.xaml:

<Application.Resources>

<ResourceDictionary.MergedDictionaries>


</ResourceDictionary.MergedDictionaries>

</Application.Resources>

But if I use the either the "new" method for both HandyControl and HandyControls:
<Application.Resources>

<ResourceDictionary.MergedDictionaries>
hc:ThemeResources/
hc:Theme/
</ResourceDictionary.MergedDictionaries>

</Application.Resources>

<Application.Resources>

<ResourceDictionary.MergedDictionaries>
<hc:Theme Name="HandyTheme"/>
</ResourceDictionary.MergedDictionaries>

</Application.Resources>

It does not work.

I want to change some of the theme colors so I'm using the unofficial version (again -> 3.4.4), but I get the following error;

For some reason it states that it can't load the type from version 3.4.0.0!
It seems like a bug to me, but I could be wrong.
Any help appreciated

Steps to reproduce the bug

Add nuget packet HandyControls 3.4.4

Add to App.xaml

<Application.Resources>

<ResourceDictionary.MergedDictionaries>
hc:ThemeResources/
hc:Theme/
</ResourceDictionary.MergedDictionaries>

</Application.Resources>

Expected behavior

No response

Screenshots

No response

NuGet package version

None

IDE

Visual Studio 2022

Framework type

.Net 6.0

Windows version

Windows 11 (22000)

Additional context

No response