ITS has posted a hotfix for the most recent beta release of UT Drupal Kit 3.0 (UTDK 3).
The 3.0.0-beta.10.2 release fixes a bug that prevents JavaScript from being loaded in certain circumstances. The only observed regression was that pages that use Search API facets with checkboxes would no longer display.
Once a site is updated to version 3.0.0-beta.10.2, JavaScript on pages should load normally.