Placement cannot add learner with the rule

[nolouch]

Bug Report

What did you do?

region:

[root@tc-pd-0 /]# ./pd-ctl region 10894
{
  "id": 10894,
  "start_key": "7480000000000003FFBD00000000000000F8",
  "end_key": "7480000000000003FFBE00000000000000F8",
  "epoch": {
    "conf_ver": 95,
    "version": 478
  },
  "peers": [
    {
      "role_name": "Voter",
      "id": 10895,
      "store_id": 7
    },
    {
      "role_name": "Voter",
      "id": 10898,
      "store_id": 33
    },
    {
      "role_name": "Voter",
      "id": 10899,
      "store_id": 16
    }
  ],
  "leader": {
    "role_name": "Voter",
    "id": 10895,
    "store_id": 7
  },
  "cpu_usage": 0,
  "written_bytes": 0,
  "read_bytes": 0,
  "written_keys": 0,
  "read_keys": 0,
  "approximate_size": 1,
  "approximate_keys": 0
}

ruleFit:

[root@tc-pd-0 /]# curl http://127.0.0.1:2379/pd/api/v1/config/rules/region/10894/detail
{
  "rule-fits": [
    {
      "rule": {
        "group_id": "TiDB_DDL_957",
        "id": "table_rule_957_0",
        "index": 40,
        "start_key": "7480000000000003ffbd00000000000000f8",
        "end_key": "7480000000000003ffbe00000000000000f8",
        "role": "voter",
        "is_witness": false,
        "count": 3,
        "label_constraints": [
          {
            "key": "engine",
            "op": "notIn",
            "values": [
              "tiflash"
            ]
          }
        ],
        "version": 5,
        "create_timestamp": 1696924085
      },
      "peers": [
        {
          "id": 10895,
          "store_id": 7
        },
        {
          "id": 10898,
          "store_id": 33
        },
        {
          "id": 10899,
          "store_id": 16
        }
      ],
      "peers-different-role": null,
      "isolation-score": 0,
      "witness-score": 0
    },
    {
      "rule": {
        "group_id": "TiDB_DDL_957",
        "id": "table_rule_957_1",
        "index": 40,
        "start_key": "7480000000000003ffbd00000000000000f8",
        "end_key": "7480000000000003ffbe00000000000000f8",
        "role": "learner",
        "is_witness": false,
        "count": 3,
        "label_constraints": [
          {
            "key": "disk",
            "op": "in",
            "values": [
              "ssd"
            ]
          },
          {
            "key": "engine",
            "op": "notIn",
            "values": [
              "tiflash"
            ]
          }
        ],
        "version": 4,
        "create_timestamp": 1696924209
      },
      "peers": null,
      "peers-different-role": null,
      "isolation-score": 0,
      "witness-score": 0
    }
  ],
  "orphan-peers": null
}

store 7,33,16 is labeled as ssd,rule check cannot generate operator to add learner

What did you expect to see?

rule check cannot generate operator to add learner (expect 3 learners)

What version of PD are you using (pd-server -V)?

master + master tidb