Safari App Extension support

There seems to be no support for Safari App Extensions out of the box. Referencing: https://bugzilla.xamarin.com/show_bug.cgi?id=53094

I am currently trying to develop a Safari App Extension and since there is no project template for such an extension, I tried to create the project manually. It seems to work until some point during runtime, when this exception happens, which I found in a crash report in ```/Users/dev/Library/Logs/DiagnosticReports```:

> Crashing on exception: -[_NSXPCDistantObject ___nsx_pingHost:]: unrecognized selector sent to instance 0x60c000095bd0

Unfortunately I am totally new to both Xamarin and Mac development, which is why I am asking for help here. Is this a Xamarin related issue or an error on my side? Is any further information necessary?