How to handle my row actions on a custom list table in the admin section

Apparently the right way to do this is to get the suffix returned by your custom page that normally displays the table and use it to hook into the page load before any admin content is rendered.

add_action('admin_menu', function() {
    $page_hook_suffix = add_submenu_page( # or related function
        …
        function() {
            # content of table page
        }
    );
    if ($page_hook_suffix) {
        add_action("load-$page_hook_suffix", function() {
           # verify nonces, handle actions, redirect, etc.
        });
    }
});