[Defender] Defender and the WP login cookie expiry

With Defender active I was finding that the wordpress_logged_in... cookie had an expiry date of December 1969 on Chrome and so users kept being logged out. This doesn't appear to be a problem with other browsers and is resolved by deactivating Defender. Is this something you've come across before and is it something that can be resolved as I'd like to have Defender active?