N1QL: Array Indexing: meta with an array index should be covered inspite of the particular array field being present in the index

As of today the following meta query:
EXPLAIN SELECT meta().id FROM default WHERE ANY v IN b SATISFIES v.x > 10 END;

shows meta is covered if the particular array index has b also in it.

Array Index:
CREATE INDEX `ix` ON `default`((distinct (array (`v`.`x`) for `v` in `b` end)),b)

But meta should be covered whether or not b is part of ix array index or not.
i.e.
CREATE INDEX `iy` ON `default`((distinct (array (`v`.`x`) for `v` in `b` end)))
should also cover meta in above query.