spring cloud alibaba 2022.0.0.0-RC1版本，sentine控制台设置系统规则，走了规则，但是统一异常处理未能捕获异常，是怎么回事？

[liuyu28]

1、配置了系统规则

2、增加了统一异常处理
`@Component
public class MyBlockExceptionHandler implements BlockExceptionHandler {
private static final Logger log = LoggerFactory.getLogger(MyBlockExceptionHandler.class);

@Override
public void handle(HttpServletRequest httpServletRequest, HttpServletResponse response, BlockException e) throws Exception {
    log.info("=====MyBlockExceptionHandler=====");
    Result r = null;
    if (e instanceof FlowException) {
        r = Result.error(100, "限流了");
    } else if (e instanceof DegradeException) {
        r = Result.error(101, "降级了");
    } else if (e instanceof ParamFlowException) {
        r = Result.error(102, "热点参数限流了");
    } else if (e instanceof SystemBlockException) {
        r = Result.error(103, "触发系统保护机制了");
    } else if (e instanceof AuthorityException) {
        r = Result.error(104, "授权规则不通过");
    }

    //返回json数据
    response.setStatus(500);
    response.setCharacterEncoding("utf-8");
    response.setContentType("application/json;charset=utf-8");
    new ObjectMapper().writeValue(response.getWriter(), r);
}

}`

3、测试查看实时监控，发现确实按照规则QPS通过了2，但是降级处理一直没有走

按照异常统一处理逻辑，应该返回"触发系统保护机制了"，但是接口一直正常返回，请问会是什么原因导致？