Inconsistent query results for the same value in a GENERATED column

## Bug Report

Please answer these questions before submitting your issue. Thanks!

### 1. Minimal reproduce step (Required)

case 1
```SQL
CREATE TABLE t0(`c0` float GENERATED ALWAYS AS (`c1`), `c1` float);
INSERT INTO t0(c1) VALUES (0.5822439);
SELECT * FROM t0 WHERE (~ (CAST(c0 AS DATETIME)));
```
case 2
```SQL
CREATE TABLE t0(`c1` float);
INSERT INTO t0(c1) VALUES (0.5822439);
SELECT * FROM t0 WHERE (~ (CAST(c1 AS DATETIME)));
```
### 2. What did you expect to see? (Required)
case 1 and case 2 should return the same result.
### 3. What did you see instead (Required)
case 1 returns nothing, while case 2 returns the value 0.5822439.
### 4. What is your TiDB version? (Required)

Release Version: v7.0.0
Edition: Community
Git Commit Hash: 7376954cd868dbc44fc3015c9ef89c53749339a7
Git Branch: heads/refs/tags/v7.0.0
UTC Build Time: 2023-03-29 13:32:13
GoVersion: go1.20.2
Race Enabled: false
TiKV Min Version: 6.2.0-alpha
Check Table Before Drop: false
Store: tikv