@MWDelaney, it works locally, just not on deploys.
@ben’s link solved worked for me as well.
As @QWp6t points out in that thread, here’s how to fix it– add the following:
$navbar-dark-toggler-icon-bg: none;
$navbar-light-toggler-icon-bg: none;
to file: resources/assets/styles/common/_variables.scss
Thanks guys.