Nested Radzen dialogs is hidden by the parent dialog

I have a parent side dialog
await DialogService.OpenSideAsync(
options: new SideDialogOptions
{
Position = DialogPosition.Bottom,
Height = "90%",
CloseDialogOnOverlayClick = true
});

I launch a child dialog from the parent dialog via:
var confirmationResult = await this.DialogService.Confirm("Are you sure?", "my title", new ConfirmOptions { OkButtonText = "Yes", CancelButtonText = "No" });
if (confirmationResult == true)
{
...
}

problem is that the confirmation dialog is hidden by the parent dialog. Only if I close the parent dialog, do I see the confirmation dialog.
(same issue also happens with regular dialogs).