Return null when limit is greater than the remaining data when Hibernate is paged?

< H2 > description: < / H2 >

there are 19 pieces of data in total. When using PageRequest.of (page, limit) for paging query, as long as the limit parameter is greater than 19, it is found to be empty.
less than 19:00, function is normal.

< H2 > Test Code < / H2 >
 @Test
    public void t1() {
        //ok
        List<Employee> employees = employService.getEmployees(1,20);

        System.out.println(employees.size());
    }
< H2 > Service Code < / H2 >
public List<Employee> getEmployees(int page, int limit) {

        return employeeRepo.findAllByStatus(1, PageRequest.of(page, limit));
    }
< H2 > Dao Code < / H2 >

List < Employee > findAllByStatus (int status,Pageable pageable);

< H1 > has been solved, where to delete the problem? < / H1 >
Mar.01,2021
MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1bf0c3a-31d0e.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1bf0c3a-31d0e.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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