ImageSource Binding not showing - xamarin.forms

Question

I have already tried to solve it via reddit but i did not find any solution there. I have following code which gets me and ImageSource from my AccountViewModel and sets the ProfileImage property on the CommentViewModel to the same Image. The Image is not available as a saved files since it comes from my Backend Server. I already chacked, that the ProfileImage Property actually gets the right image, it does, also the Property Changed event fires and if i set the Property to an ImageSource.FromFile with a test Image which i have saved as a file it works. I really don't see any reason why it would not work with the image i get from the other viewmodel.
As the Image is a normal Property mit [BindableProperty] Annotation in the AccountViewModel and i have confirmed that the Types are exactly the same i do not show the AccoutnViewModel here to make it a bit shorter.
I do not get why the Start of every CodeBlock looks so strange.
CommentView:
<ContentPage.Content>
<StackLayout Margin="15">
<StackLayout Orientation="Horizontal">
<ffimageloading:CachedImage Source="{Binding ProfileImage, FallbackValue=default_user.jpg}"
HeightRequest="50"
WidthRequest="50"
VerticalOptions="CenterAndExpand"
HorizontalOptions="StartAndExpand">
<ffimageloading:CachedImage.Transformations>
<fftransformations:CircleTransformation/>
</ffimageloading:CachedImage.Transformations>
</ffimageloading:CachedImage>
<Label Text="{Binding Username}"
FontSize="13"/>
</StackLayout>
</StackLayout>
</ContentPage.Content>
CommentViewModel:
public partial class CommentViewModel : BaseViewModel
{
// == constants ==
// == observable properties ==
[ObservableProperty]
public long id;
[ObservableProperty]
public string username;
[ObservableProperty]
public string description;
[ObservableProperty]
ImageSource profileImage;
partial void OnProfileImageChanged(ImageSource value)
{
Console.WriteLine("profile changed");
}
// == constructors ==
public CommentViewModel(DisplayPostViewModel displayPostViewModel)
{
//profileImage = ImageSource.FromFile("default_user.jpg");
navigationService.DataBetweenViewModel<AccountViewModel>(this, "ProfileImage", "ProfileImage", true);
//profileImage = ImageSource.FromFile("default_user.jpg");
}
public CommentViewModel()
{
}
}
NavigationService:
public bool DataBetweenViewModel<ReceivingViewModel>(BaseViewModel sendingViewModel, string sendingPropertyName = null, string receivingPropertyName = null, bool isGettingFromOther = false)
where ReceivingViewModel : BaseViewModel
{
try
{
PropertyTransferObject transferObject;
var mainpage = Application.Current.MainPage as NavigationPage;
var tabbedPage = mainpage.RootPage as TabbedPage;
var recievingVM = tabbedPage.Children.SelectMany(tab => tab.Navigation.NavigationStack?
.Select(page => page.BindingContext)).OfType<ReceivingViewModel>();
if (isGettingFromOther)
{
transferObject = new PropertyTransferObject(recievingVM.First(), sendingViewModel, sendingPropertyName, receivingPropertyName);
}
else
{
transferObject = new PropertyTransferObject(sendingViewModel, recievingVM.First(), sendingPropertyName, receivingPropertyName);
}
objectMapper.TransferProperties(transferObject);
return true;
}
catch( Exception ex)
{
string e = ex.ToString();
return false;
}
}
ObjectMapper:
public void TransferProperties(PropertyTransferObject propertyTransferObject)
{
if (propertyTransferObject.SendingPropertyName != null && propertyTransferObject.ReceivingPropertyName != null
|| (propertyTransferObject.SendingPropertyName != String.Empty && propertyTransferObject.ReceivingPropertyName != String.Empty))
{
foreach (PropertyInfo recievingProp in propertyTransferObject.ReceivingObject.GetType().GetProperties())
{
foreach (PropertyInfo sendingProp in propertyTransferObject.SendingObject.GetType().GetProperties())
{
if (sendingProp.Name == propertyTransferObject.SendingPropertyName && recievingProp.Name == propertyTransferObject.ReceivingPropertyName)
{
recievingProp.SetValue(propertyTransferObject.ReceivingObject, sendingProp.GetValue(propertyTransferObject.SendingObject, null), null);
}
}
}
}
if (propertyTransferObject.SendingPropertyName == null && propertyTransferObject.ReceivingPropertyName == null
|| (propertyTransferObject.SendingPropertyName == String.Empty && propertyTransferObject.ReceivingPropertyName == String.Empty))
{
foreach (PropertyInfo recievingProp in propertyTransferObject.ReceivingObject.GetType().GetProperties())
{
foreach (PropertyInfo sendingProp in propertyTransferObject.SendingObject.GetType().GetProperties())
{
if (recievingProp.Name == sendingProp.Name && recievingProp.PropertyType == sendingProp.PropertyType)
{
recievingProp.SetValue(propertyTransferObject.ReceivingObject, sendingProp.GetValue(propertyTransferObject.SendingObject, null), null);
}
}
}
}
}