The migration assigned all filters to user's organizations, however Host filters do not support organizations (they do not include Taxonomix) and hosts can be assigned only to one organization. The code that searches filters raised an exception which is ignored silently and the result of searching was an empty set.

To remove host filter taxonomy associations you can run these two commands in rails console. The second one should print true. Don't forget to backup your database before running it. This will remove any organization assignment of host filters. It may not be your desired setup so be careful.

filters = Filter.all.select { |filter| filter.resource_type == 'Host'&& !filter.taxonomy_search.nil?  }
filters.map { |filter| filter.update_attribute :taxonomy_search, nil }

I'll work on fixing taxonomy filters for hosts and disallowing it for resources that do not support them. Also I'll try to find the silent exception swallowing and remove it.