per_page_options drop-down is not working

[jcalfee]

The per_page_options drop down button appears ok, but the drop down does not appear when clicked.

I can see in the DOM inspector that the .dropdown-menu style is matching (from _dropdown.scss) and these classes are used on <a .. link elements: dropdown-menu dropdown-item

bootstrap 4.6.1
bootstrap-vue 2.16.0
vue-bootstrap4-table 1.1.11
Setup https://bootstrap-vue.org/docs#getting-started-with-nuxtjs