Recently (Angular component with varying appearance) I wrote how to use the same
<ng-content> twice in a switch case.
Today I hit upon explanation of this fact in a GitHub issue (https://github.com/angular/angular/issues/22972) and I found another problem.
Namely, it is not possible to display at the same time twice the same
<ng-content> even if it is packed inside a
<ng-template>. Therefore the following example will not work: