Uncaught ReferenceError: once is not defined (bootstrap-ui-kit.js)

Problem/Motivation

Looks like we're getting a new error about;

bootstrap-ui-kit.js?v=9.5.7:67 Uncaught ReferenceError: once is not defined
at bootstrap-ui-kit.js?v=9.5.7:67:12

Steps to reproduce

Proposed resolution

Remaining tasks

User interface changes

API changes

Data model changes