@manfredsteyer First of all congratulations on a fabulous POC for using Web Components for Micro- frontends .
While the client-b gets rendered we get a Zone error thrown for the client-a-widget
"Uncaught Error: Expected to not be in Angular Zone, but it is!"
A screen shot is attached

BTW: This error is not due to using it in the client-b web component as this happens even if we use the client-a-widget within client-a itself. Could this be a bug in Angular Elements ?