This article will provide a solution to the ACS Commons multi-field extension, checkbox Granite UI Component.
While utilizing the ACS Commons multi-field extension, for everything I tried, I am not able to get the checkbox Granite UI component working as expected. Not an elegant way to solve the problem, but something that actually works and is sustainable.
I found a solution that is simple. Instead of using the checkbox Granite UI Component, use the select Granite UI Component, granite/ui/components/coral/foundation/form/select. This works; problem solved.
Not Working Checkbox
As you can see here, in line:24, the acs-commons-nested property is not picking up the Granite UI Component, checkbox.