Query result has zero rows when using list-type columns and facet values uses UNDEFINED_NULL_NOTSET

It appears that the backend is not processing the org.sagebionetworks.UNDEFINED_NULL_NOTSET value correctly for list-type columns when using that value in the facetValues query request field. It is incorrectly returning zero results.

Steps to replicate issue

• Visit my demo project here - https://www.synapse.org/#!Synapse:syn22041545/tables/query

• Under 'veggie list' click 'Not set'

• Zero rows are returned instead of the two containing 'apple, pear' and 'strawberry'

One thing to note-
I noticed this issue arises when there are two or more list-type columns, with a single list type column there is no issue