Kendo-angular: [Toolbar] nesting a <kendo-toolbar-button> inside ng-container isn't possible

[svetq]

Describe the bug
Currently using Angular 9 if a<kendo-toolbar-button> is nested within an ng-container then the button isn't rendered. There are no errors in the browser console and the application compiles successfully.
toolbar.zip

To Reproduce
Please create an Angular 9 project or download the attached one and use the following markup:

<kendo-toolbar [overflow]="true">
    <ng-container>
        <kendo-toolbar-button [text]="'foo'">
        </kendo-toolbar-button>
    </ng-container>
</kendo-toolbar>

[ncrawlins]

I don't know if this needs to be a separate issue, but in a grid, grid-columns that are in an ng-container don't render either. this was working in angular 8.

[svetq]

also reported in 1453814

[tsvetomir]

Seems to be caused by https://github.com/angular/angular/issues/34768. The fix seems to be on the way.

Can be worked around by adding { descendants: true } to the ToolBarComponent.allChildren field, but there seem to be many instances of the problem. Let's wait a few more days for the fix to land in a patch release of Angular.

[svetq]

also reported in 1453886 regarding the Charts

[urdeveloper]

Had the same problem with toolbar using Angular 9.0.1. Just updated to 9.0.2, seems to be working now.