@ContentChildren() doesn't work when the elements were passed through 2 components

<grand-parent>
    <child></child>
    <child></child>
</grand-parent>

Where <grand-parent> looks like

<parent>
  <ng-content></ng-content>
</parent>

and <parent> like

<ng-content></ng-content>

I want to query the children from the ParentComponent

the children are displayed where they are expected, just

@ContentChildren(ChildComponent, descendants: true) QueryList<ChildComponent> children;

doesn't work (with or without descendants: true)

When I use ParentComponent like

<parent>
    <child></child>
    <child></child>
</parent>

The ContentChildren() query works fine.

I combined parent and child into one component and this work as well (with only one <ng-content> level) .