QML Treeview row selection is not following the click operation

The name and version number of your compiler :  VS2017 / GCC9

Qt version : 5.12.9

The name and version number of your operating system: Windows 10  and Ubuntu 16.04 LTS

Please refer the attached test app & screenshot TreeViewModel.zipwhich contains TreeView and QStandardItemModel.

QStandardItemModel  , sets two roles ,

m_roles[Qt::UserRole] = "index";

m_roles[Qt::UserRole + 1] = "one";

TreeView has two columns with above role names

If we click on any row in Treeview , previous row looks to be selected as row highlighter appear for previous row.

Expected behavior: Clicked row should be selected 

Actual behavior :  Clicked row and row selection is off by one