QComboBox: Row selection does not remain selected for the listview after collapsing and reopening the dropdown

When having a QComboBox with a QTableView in it, and calling

tableView->setSelectionBehavior(QAbstractItemView::SelectRows);
tableView->setSelectionMode(QAbstractItemView::SingleSelection);

to set the model selection mode and behaviour, then when the selection is made, it initially appears to work but when the dropdown is closed and reopened, only a single item (in the first column) remains selected.