Notification links do not work in Opera 60+

Environment

• ABP 3.6.2 (current release), as well as ABP 3.6.2.2372 (latest dev build)
• Opera v.60+ (reproduced on versions 60 and 62)
• links work on Chrome, while Firefox does not support buttons in notifications (see https://bugzilla.mozilla.org/show_bug.cgi?id=1190681)

How to reproduce

1. Trigger a desktop notification with a link, such as the one below.
2. Click on the button in the notification.

Observed behaviour

Link does not open and notification gets dismissed after clicking on the button. No errors are thrown in the console.

Expected behaviour

The notification link should be opened successfully after the CTA button in clicked.

Test notification

{
  "notifications": [
    {
      "id": "links_1_desktop",
      "severity": "normal",
      "links": [
        "adblock_browser_promotion_0"
      ],
      "title": {
        "en-US": "Test 1 Link Notification",
        "de": "DE Test 1 Link Notification"
      },
      "message": {
        "en-US": "This is a <a>Link1</a> notification.",
        "de": "DE This is a <a>Link1</a> notification."
      }
    }
  ],
  "version": "201810011538"
}