Dependent field dropdown/select behaves differently in Internet Explorer

I believe this issue is limited to Internet Explorer (IE11). I haven't experienced this in other tested browsers Chrome/FF.

Repeatable: Always
Steps to repeat:
1. Set up Dependent Fields as described in this article: https://www.drupal.org/docs/8/modules/business-rules/advanced-usage/depe... → . In my case, my parent and dependent fields are on the User account at /admin/config/people/accounts/fields.
3. Add a user at /admin/people/create, and select a value for the parent field.

Expected Results:
Dependent fields display dropdown/select options based on the parent field value.

Actual Results:
In Internet Explorer only, dropdown/selects are blank, with no options available to select. There are no errors in the browser, Watchdog, or Apache.

The site I'm building is for an organization that uses IE exclusively. Wondering if anyone else has experienced this issue or has any thoughts or direction for further troubleshooting.