Currently due to the way filters are output, when you choose Select as the type, it is wrapped in a div. Thus, if you specify an ID for the filter, this gets applied to the div, not the select tag in the output.
In order to target the field itself, it will be great to either
- remove the div (if it doesn’t cause an issue to do so) and apply the ID directly to the select element
- have an alternative way to set the ID on the generated select element