Index advisor incorrectly recommend an index with multiple array keys for UNNEST

ADVISE SELECT META(b).id

FROM default b UNNEST b.arr1 AS a

WHERE

    b.c1 = "green"

    AND NOT (a.c2 = "abc" AND a.c3 = "abc")

;

    {

        "#operator": "Advise",

        "advice": {

            "#operator": "IndexAdvice",

            "adviseinfo": {

                "recommended_indexes": {

                    "indexes": [

                        {

                            "index_statement": "CREATE INDEX adv_c1_ALL_arr1_c3_ALL_arr1_c2 ON `default`(`c1`,ALL ARRAY `a`.`c3` FOR a IN `arr1` END,ALL ARRAY `a`.`c2` FOR a IN `arr1` END)",

                            "keyspace_alias": "default_b",

                            "recommending_rule": "Index keys follow order of predicate types: 1. Common leading key for disjunction (2. equality/null/missing), 1. leading array index for unnest."

                        },

                        {

                            "index_statement": "CREATE INDEX adv_ALL_arr1_c3_c1 ON `default`(ALL ARRAY `a`.`c3` FOR a IN `arr1` END,`c1`)",

                            "keyspace_alias": "default_b",

                            "recommending_rule": "Index keys follow order of predicate types: 1. leading array index for unnest, 2. equality/null/missing."

                        }

                    ]

                }

            }

        },

        "query": "SELECT META(b).id FROM default b UNNEST b.arr1 AS a WHERE b.c1 = \"green\" AND NOT (a.c2 = \"abc\" AND a.c3 = \"abc\");"

    }