Here’s description from WordPress Codex about what happen when WordPress title empty when viewing index page/ homepage
If you are using a custom homepage with custom loops and stuff or a custom front-page, you will have an empty wp_title.
I recently encountered this problem on a client’s site. Homepage/Index page is using a static page (WP Dashboard > Settings > Reading > A Static Page > Front page)
Simple solution like this
Using a conditional to display site title when viewing homepage
<?php is_front_page()?bloginfo('name'):wp_title(''); ?>Complete code like this
<?php is_front_page()?bloginfo('name'):wp_title(''); wp_title(''); ?>Post/page outputs: Page Title
Homepagd outputs: Site Name
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