Bug in Treetable: When column generated by columGenerator, it does not react to left mouse click (Cuba 7.2.21)

Hi,
I have following code:

   @Install(to = "customersTable.name", subject = "columnGenerator")
    private Component customersTableNameColumnGenerator(Customer customer) {
 
        Label<String> lbl = uiComponents.create(Label.class);
        lbl.setHtmlEnabled(true);
     
        String sValue = "<div style=\"font-size:10px;text-align: left;line-height: 110%;\"><div >M1: merkmal1-1</div></div><div style=\"font-size:10px;text-align: left;line-height: 110%;\"><div >M2: merkmal2-2</div></div><div style=\"font-size:10px;text-align: left;line-height: 110%;\"><div >M3: merkmal3-2</div></div><div style=\"font-size:10px;text-align: left;line-height: 110%;\"><div >M5: merkmal5-1</div></div>";
        lbl.setValue(sValue);

        return lb;
    }

It works fine in GroupTable, but TreeTable does not fire left mouse event. Right mouse event works.
A Workaround with CssLayout is working, but not really the final solution.

        CssLayout layout = uiComponents.create(CssLayout.NAME);
        layout.addLayoutClickListener(layoutClickEvent -> {
            customersTable.setSelected(customer);
        });    
    ....
    ....
       layout.add(lbl);
      return layout;

Any Ideas?

Regards Manfred