[Bug Report] el-select在focus時回顯異常

### Element UI version
2.15.14

### OS/Browsers version
'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.36'

### Vue version
2.7.16-beta.1

### Reproduction Link
https://codepen.io/sulongxiansheng/pen/bGzZGZY

### Steps to reproduce
進入鏈接：https://codepen.io/sulongxiansheng/pen/bGzZGZY
1.點擊“開始”按鈕
2.分別點開“運行正常”和“運行異常”的下拉框查看

### What is Expected?
與“運行正常”一致

### What is actually happening?
“運行異常”的回顯異常