Labels in combo box not working anymore

We used to add labels to combobox items as we can format ( e.g. This is Test) data to be shown instead of plain text and it used to work like charm, but since with vaadin upgrade to 7.6.4 from 7.4.5 we started noticing instead of displaying messages it displays class name, please have a look at the attachment. Did the behaviour of vaadin combo box change on how it displayes messages, can’t we add labels anymore.