show stats display 0 vertices after drop all tags

[HarrisChu]

we add vertex key in v3.0
but if drop all tags, show stats display 0 vertices.

(root@nebula) [sf1]> show stats
+---------+------------------+----------+
| Type    | Name             | Count    |
+---------+------------------+----------+
| "Edge"  | "CONTAINER_OF"   | 1003605  |
| "Edge"  | "HAS_CREATOR"    | 3055774  |
| "Edge"  | "HAS_INTEREST"   | 229166   |
| "Edge"  | "HAS_MEMBER"     | 1611869  |
| "Edge"  | "HAS_MODERATOR"  | 90492    |
| "Edge"  | "HAS_TAG"        | 3721409  |
| "Edge"  | "HAS_TYPE"       | 16080    |
| "Edge"  | "IS_LOCATED_IN"  | 3073620  |
| "Edge"  | "IS_PART_OF"     | 1454     |
| "Edge"  | "IS_SUBCLASS_OF" | 70       |
| "Edge"  | "KNOWS"          | 180623   |
| "Edge"  | "LIKES"          | 2190095  |
| "Edge"  | "REPLY_OF"       | 2052169  |
| "Edge"  | "STUDY_AT"       | 7949     |
| "Edge"  | "WORK_AT"        | 21654    |
| "Space" | "vertices"       | 0        |
| "Space" | "edges"          | 17256029 |
+---------+------------------+----------+
Got 17 rows (time spent 1229/3013 us)

Tue, 25 Jan 2022 04:53:25 UTC

(root@nebula) [sf1]> fetch prop on * 1786710742272 yield id(vertex)
+---------------+
| id(VERTEX)    |
+---------------+
| 1786710742272 |
+---------------+
Got 1 rows (time spent 4617/6165 us)

Tue, 25 Jan 2022 04:56:05 UTC

(root@nebula) [sf1]> fetch prop on * 1786710742272 yield tags(vertex)
+--------------+
| tags(VERTEX) |
+--------------+
| []           |
+--------------+
Got 1 rows (time spent 2160/3743 us)

Tue, 25 Jan 2022 04:59:19 UTC

[HarrisChu]

duplicate with #3649