ha_rocksdb::records_in_range() vastly overestimates the number of rows in certain ranges

CREATE TABLE obj2 (

  part_id smallint(5) unsigned NOT NULL,

  oid bigint(20) unsigned NOT NULL,

  tid bigint(20) unsigned NOT NULL,

  filler char(32),

  KEY tid (part_id,tid,oid)

) ENGINE=ROCKSDB;

create table ten(a int primary key);

insert into ten values (0),(1),(2),(3),(4),(5),(6),(7),(8),(9);

create table one_k(a int primary key);

insert into one_k select A.a + B.a* 10 + C.a * 100 from ten A, ten B, ten C;

create table hundred(a int primary key);

insert into hundred select A.a + B.a* 10 from ten A, ten B;

set rocksdb_bulk_load_size=10000, rocksdb_commit_in_the_middle=1;

insert into obj2

select 

  0, 

  A.a + 1000*B.a + 1000000*C.a,

  A.a + 1000*B.a + 1000000*C.a,

  'filler-data'

from one_k A, one_k B, hundred C;

insert into obj2

select 

  1,

  A.a + 1000*B.a + 1000000*C.a,

  A.a + 1000*B.a + 1000000*C.a,

  'filler-data'

from one_k A, one_k B, hundred C;

set global rocksdb_force_flush_memtable_and_lzero_now =1;

part_id=0, tid=0

part_id=0, tid=1

...

part_id=0, tid=100M

part_id=1, tid=0

part_id=1, tid=1

...

part_id=1, tid=100M

analyze format=json select * from obj2 force index (tid) where part_id=0 and tid>100000000\G

*************************** 1. row ***************************

ANALYZE: {

  "query_block": {

    "select_id": 1,

    "r_loops": 1,

    "r_total_time_ms": 0.2885,

    "table": {

      "table_name": "obj2",

      "access_type": "range",

      "possible_keys": ["tid"],

      "key": "tid",

      "key_length": "10",

      "used_key_parts": ["part_id", "tid"],

      "r_loops": 1,

      "rows": 104100545,

      "r_rows": 0,

      "filtered": 52.05,

      "r_filtered": 100,

      "index_condition": "obj2.part_id = 0 and obj2.tid > 100000000"

    }

  }

}

      "rows": 104100545,

      "r_rows": 0,