[Bug] Pie chart set label to center and disable emphasis label, one of the labels doesn't show

### Version

6.0.0

### Link to Minimal Reproduction

https://echarts.apache.org/examples/zh/editor.html?c=pie-borderRadius&code=PYBwLglsB2AEC8sDeAoWszGAG0iAXMmuhgE4QDmFApqYQOQRjUC29xAvgDTHbU3QAJoVQkMoBgFYApPR5i-AMzAMAxtWjNS7dN2IBnWhGr7CAbWLpRY2NACGLagwCCq9fv2wAYqWBt5NmAAniBOsPQgxnKWJKR2ghAArqawZvQALAAMslzhAOzZ9AC6AWJ2AG7AEIIAMnYARtTYAPLltNh2BLCKdtiGpSRMrADKwXwiMWL1wKSCtABK8UkpAIyZA1Mzc6QAwjgzDADEiifRNiTTs7QA6tVgABaEAEyTsHrnHY3YE-fo-vfAADuhDApES1A2JBAwH0TCg0DUGi0Z1-ihmLDsYC0DEAiEaAejNAF9qgCztQDhpoB1bR0NneNlYIHudlhKWsHwaTR-vz-AOB3V6_VgAHp-bAAISwCAsaGkMB2TSwVQwRSUV66V7UhSs7A1CDQMLMmz_IGEHp9aiqyGCTF2czK5Cwcq9cGENbpAAcuXsjgYw2odlIqnusAAotAKNrqPQ3pCrHaHWE8gBmSTuhxhegAEQgpGoqjAEbVNiQMewjtgkhd61sKYYgYxEGweajtvtxbCrvSyc94QAqtB4bBnIJ9A2bYXmyX45kKx7UwA1arUYD9wd515FGIcYhrjgAbiAA

### Steps to Reproduce

1. I want to put some text in the center of the pie charts, but emphasis makes the label rendered twice, so i have to disable it.
2. When i disable the emphasis label, one of the labels disappeared when i hover on the item.
```
label: {
show: true,
position: 'center',
formatter: '我是固定文字'
},
emphasis: {
label: {
show: false, // ! important config
}
},
```

### Current Behavior

### Expected Behavior

### Environment

```markdown
- OS:
- Browser:
- Framework:
```

### Any additional comments?

_No response_