Index Advisor makes duplicate index recommendations even with two queries as input

Here is the reproduction using optim_focus_suites.

SELECT ADVISOR(["SELECT MAX(x.u016_n) FROM KS2 x JOIN KS1 y ON x.u04k_i = y.u04k_i WHERE x.norm_n <= 37212 AND y.norm_n <= 37212 GROUP BY x.u256_i ORDER BY x.u256_i LIMIT 25",
                            "SELECT MAX(x.u016_n) FROM KS1 x JOIN KS2 y ON x.u04k_i = y.u04k_i WHERE x.norm_n <= 33545 AND y.norm_n <= 33545 GROUP BY x.u256_i ORDER BY x.u256_i LIMIT 25"]) AS Multiple;

These are the CREATES it generates.  

"index": "CREATE INDEX adv_norm_n_u04k_i ON `KS1`(`norm_n`,`u04k_i`)",
 "index": "CREATE INDEX adv_norm_n_u04k_i ON `KS1`(`norm_n`,`u04k_i`)",                  

"index": "CREATE INDEX adv_norm_n_u04k_i ON `KS2`(`norm_n`,`u04k_i`)",

"index": "CREATE INDEX adv_norm_n_u04k_i ON `KS2`(`norm_n`,`u04k_i`)",             

       "index": "CREATE INDEX adv_norm_n_u04k_i_u256_i_u016_n ON `KS1`(`norm_n`,`u04k_i`,`u256_i`,`u016_n`)",
                    "index": "CREATE INDEX adv_norm_n_u04k_i_u256_i_u016_n ON `KS2`(`norm_n`,`u04k_i`,`u256_i`,`u016_n`)",