WHERE condition lost from conditional unique index

I am attempting to apply an Unique Index in Postgresql with mixed results. I am generating the index via a Ruby on Rails migration. The up statement looks like:

execute("create unique index formatted_address_unit_number_and_status        on properties (formatted_address, unit_number)        where status = 'published';")

On my local development the index works as intended. If I take a look at the properties table by running \d properties, the migration correctly added index like so:

"formatted_address_unit_number_and_status" UNIQUE,btree (formatted_address, unit_number) WHERE status::text = 'published'::text

However, when my Jenkins CI server runs the migration, I only see the following in the propertiestable:

"formatted_address_unit_number_and_status" UNIQUE, btree (formatted_address, unit_number)

Why would the migration work on my development but not on Jenkins? Am I applying the unique index correctly to begin with?