QTreeWidget Delegate setModelData limitations

I have QTreeWidget, i set for item delegate:

Code:

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tree.setItemDelegate(new TimeEdit(tree));

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as in below code i set editor data and model data properly.

Code:

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public void setModelData(QWidget editor, QAbstractItemModel model, QModelIndex index) {
    		model.setData(index, ((QTimeEdit)editor).time());
    		System.out.println("setModelData: " + ((QTimeEdit)editor).time());
 
    		QTreeWidget tree = (QTreeWidget) model.parent();
    		System.out.println(tree);
    		QTreeWidgetItem item = tree.currentItem();
    		System.out.println(item);
    		action(item.parent(), item, index.data());
    	}

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Everything works but if i add new item and after this i call editItem from QTreeWidget
and edit the content it seems that not every instructions in set data ara executed.
But if i edit existing item everything work as it suppose to work.
Are there any limitations for setModelData ? Why it behaves like this ?

Greets,
Kubas