[BUG] <title> 监控中心任务监控不完整。

### Current Behavior

一个完整的监控应该是执行多个任务，但是有时候只执行一个

测试了一个官方的例子，flink on yarn 也如此

### Expected Behavior

_No response_

### Steps To Reproduce

_No response_

### Environment

```markdown
HertzBeat version(s):1.8.0
```

### Debug logs

_No response_

### Anything else?

_No response_

The report provides screenshots and mentions HertzBeat 1.8.0, a monitoring-center task, and Flink on YARN, but names no source files, tests, or reproducible steps. Start by locating the task-monitoring implementation and reproduce the missing-task behavior; done means all executed tasks appear consistently in the monitoring view.

Written by the indexing model from the issue text.