When using the Tab key to move focus on a page with an Angular ListView, after the LV itself gets focus, the next Tab press moves the focus to the selected LV item. However, if there isn't already a select item, then it will select the first item in the LV.
This makes it impossible to move focus to any element after the LV, without selecting an item. The tab key is generally used for moving focus only, not for changing selections, so the user wouldn't generally expect anything to be selected when using Tab to move focus.
Even just for setting the focus of individual items without selecting them, the tab key shouldn't be used, according the ARIA guidelines for composite UI components (https://www.w3.org/TR/wai-aria-practices-1.1/#kbd_general_within): "Once a composite contains focus, keys other than Tab and Shift + Tab enable the user to move focus among its focusable elements."