Block-Ui: Progress-Spinner is not shown if used in ps-table rowDetail

[KuhnMichael]

When you try to use a ps-block-ui inside of ps-table's psTableRowDetailTemplate the mat-spinner is not shown. The blocking backdrop is there. It seems to appear in cases where the block-ui is in a sub component.

Sample:

<!--Sub component looks like this-->

<my-subcomponent>
    <ps-block-ui [blocked]="blocked">
        ...
    </ps-block-ui>
</my-subcomponent>

<!--Implementation looks like this-->
<ps-table tableId="myId" [dataSource]="tableDataSource">
    <ps-table-column property="A" [header]="'A'"></ps-table-column>
    ...
    <ps-table-row-detail>
        <ng-container *psTableRowDetailTemplate="let item">
            <my-subcomponent></my-subcomponent>
        </ng-container>
    </ps-table-row-detail>
</ps-table>