Conveyor switch. Focus remains on the goal tab

Question

I have a problem that switchTodoes not "focus" the tab in question. I get an array of current tabs with getAllWindowHandles, and the protractor directs the actions to the desired tab, but never appears in the foreground. Therefore, elements never become visible. Am I something wrong here? (protractor 2.0.0, current Chrome)

var tabs;

function switchToUser1() {
    return browser.switchTo().window(tabs[0]);
}

function switchToUser2() {
    return browser.switchTo().window(tabs[1]);
}

beforeAll(function() {
    browser.executeScript("window.open('about:blank');");
    browser.getAllWindowHandles().then(function(handles) {
        tabs = handles;
    });
    switchToUser1();
    userPO.login(login1);
    switchToUser2();
    userPO.login(login2);
});