Cornerstone menu element issue in IE 11 (latest version)

I am getting an error when using cornerstone menu element, when viewing in IE 11. No issues in Chrome or Firefox.

When clicking on a menu item I get:

SCRIPT438: Object doesn’t support property or method ‘includes’
File: cs-body.js, Line: 1, Column: 28076

Hello There,

Unfortunately, this is a known bug on IE browser. It was already forwarded to our developer for investigation but there’s no update yet. From our development timeline, after template manager update release, first quarter of the year is for bug fixes. Again, we’re sorry for the inconvenience and we will let you know once we have an update. Thank you for understanding.

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