How are unpackaged and packaged apps different in regard to libEGL.dll?

[TommiGustafsson-HMP]

We have a .NET MAUI Windows app, which uses WinUI 3 as a backend on Windows. The app uses SkiaSharp 3.0-preview3.1 SKGLView, which has an implementation that uses libEGL.dll. Everything works in the packaged (default) mode (MSIX), but when the app is built in the unpackacked mode (-p:WindowsPackageType=None in dotnet build), libEGL.dll fails to initialize the display at the following function:

public static extern EGLDisplay eglGetPlatformDisplayEXT(uint platform, EGLNativeDisplayType native_display, int[] attrib_list);

Any idea what might be causing the problem in the unpackaged mode and why it works in the packaged mode?