tidb 7.1.0 use JSON_OBJECT with if() func cause bug

tidb 7.1.0 use JSON_OBJECT with if() func cause bug

### 1. create table and init data....
```
CREATE TABLE `tt2` (
`I_ID` bigint(20) unsigned NOT NULL AUTO_INCREMENT COMMENT '主键ID',
`I_HAS_RECEIPT` tinyint(4) NOT NULL DEFAULT '0' COMMENT '0:否，1:是',
PRIMARY KEY (`I_ID`) /*T![clustered_index] CLUSTERED */
) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_bin AUTO_INCREMENT=1 COMMENT='xx';

insert into tt2 values(1, 0),(2, 1);

select JSON_OBJECT('has_receipt',if(I_HAS_RECEIPT = 0, false, true))from tt2 limit 10;

```
### 2. What did you expect to see? (Required)
expect sql execute result return true or false, but not expect 1,0

### 3. What did you see instead (Required)


### 4. What is your TiDB version? (Required)
sql in tidb 5.0.4 is expected，but 7.1.0 is not expect....

ps：
1. in my case, use `case when then ` instead of `if()` ,and then result is ok~

2. in mysql 5.7 return 1 or 0;