Visual Studio Designer doesn't update in real time with using Data template or Control Theme with string x:Key

[softinitializing]

When defining a ControlTheme/DataTemplate in Avalonia, the Visual Studio Designer updates in real time only if the theme is keyed by control type (x:Key="{x:Type SomeControl}").

If the theme or template uses a plain string key (e.g. x:Key="SomeThemeStringKey"), the designer does not pick up changes in real time — a rebuild or running under the debugger is required before changes appear.
Most of my xaml resources are defined in Resource Dictionary axaml files then merged in App resources with "ResourceDictionary.MergedDictionaries"

Is this known issue or something i do wrong ?