Spring中嵌套调用TransactionSynchronizationManager.registerSynchronization()不生效问题求助

我最近碰到了一个Spring事务同步的问题，试了好几种方法都没解决，来求助各位大佬！

我写了三个关联的服务类，代码分别如下：

Service One #

@Service
@RequiredArgsConstructor
public class TransactionAService {

    private final TransactionBService transactionBService;

    private final UserMapper userMapper;

    @Transactional(rollbackFor = Exception.class)
    public void transactionA() {
        User user = new User();
        user.setUsername("apple-" + UUID.randomUUID().toString().replace("-", "").substring(0, 4));
        user.setPassword("abc123");
        userMapper.insert(user);
        TransactionSynchronizationManager.registerSynchronization(new TransactionSynchronization() {
            @Override
            public void afterCommit() {
                transactionBService.transactionB();
            }
        });
    }
}

Service Two #

@Service
@RequiredArgsConstructor
public class TransactionBService {

    private final TransactionCService transactionCService;

    private final UserMapper userMapper;

    @Transactional(rollbackFor = Exception.class)
    public void transactionB() {
        User user = new User();
        user.setUsername("banana-" + UUID.randomUUID().toString().replace("-", "").substring(0, 4));
        user.setPassword("abc123");
        userMapper.insert(user);
        TransactionSynchronizationManager.registerSynchronization(new TransactionSynchronization() {
            @Override
            public void afterCommit() {
                transactionCService.transactionC();
            }
        });
    }
}

Service Three #

@Slf4j
@Service
@RequiredArgsConstructor
public class TransactionCService {

    private final UserMapper userMapper;

    @Transactional(rollbackFor = Exception.class)
    public void transactionC() {
        log.info("hello cat");
        User user = new User();
        user.setUsername("cat-" + UUID.randomUUID().toString().replace("-", "").substring(0, 4));
        user.setPassword("abc123");
        userMapper.insert(user);
    }
}

现在的问题是：当我调用transactionAService.transactionA()方法后，发现transactionCService.transactionC()完全没被执行！最后数据库的user表里只有两条数据——apple开头和banana开头的，cat开头的那条根本没插进去。

我用的Spring Boot版本是2.7.18，有没有大佬能帮忙分析下原因呀？万分感谢！

备注：内容来源于stack exchange，提问作者Garmin