json_decode Failed to ignore incorrect utf8

### Description

When the following mixed text is included, json_decode Failed to ignore incorrect utf8.
Even if ```JSON_INVALID_UTF8_IGNORE```


```php
<?php
    $contents= '{"val": "测试 test  \uD83D\uDD17 \uD83D..."}';
     $body = json_decode($contents, true, 512,  JSON_INVALID_UTF8_IGNORE | JSON_THROW_ON_ERROR);
```





### PHP Version

8.1.4

### Operating System

_All_