Could not create tag index again with same name as deleted index

[yixinglu]

(root@nebula) [nba]> show tag indexes;
+-------------------------+
| Names                   |
+-------------------------+
| "company_index"         |
+-------------------------+
| "player_age_name_index" |
+-------------------------+
| "team_name_index"       |
+-------------------------+
Got 3 rows (time spent 1203/1443 us)

Wed, 30 Jun 2021 14:21:35 CST

(root@nebula) [nba]> create tag index player_age_index on player(age);
[ERROR (-1005)]: Existed!

Wed, 30 Jun 2021 14:21:37 CST

(root@nebula) [nba]>

Before above steps, I dropped the player_age_index by:

> drop tag index player_age_index;

[bright-starry-sky]

I think , the error was not caused by the same index name. the real reason is that there are duplicate columns. for example:
tag t1 (c1, c2, c3)
create index i1 (c1, c2) <----- allow
create index i2(c1 ,c2) <------ not allow, because the same columns of index is exist with i1.

I will close this issue if there is no other reason.