[Bug] The visualMap handles color is not updated when slowly sliding

### Version

5.5.0

### Link to Minimal Reproduction

https://echarts.apache.org/examples/en/editor.html?c=scatter-stream-visual&code=PTAEBUAsEMDsGsDOoAuB7AXKQp0GAADQDYoBQIokKKADhiAObQA29ApgE4CeAdEwMYwsqIAVog7c0AW2BMAHhXpoWTDmXH0A_AFcAvACMAJgFoAjADYAnAAYTJgOxniYMpWrA6jVpx58Bw0RKl6AJboLMooqmrcWtIAEgBSAO4GkABqAI6CAOqEACQcNEwocQDKAPIAcgAUhKCgAEqlpeAA-gAKAILgMaAA1KAA5MB60CjQwNCIiIVDI2OQaBpTBhQsgdxMBtCK0ABMHMJosP0ANDWgAGYasNwogYeglcOjAJSgAN5ntQBuW6BoFLd7lp3p9aqhgswsB8wTDUDIUFh-gARQKICisRB3WB_c6kBZTUArNZMUA6CZMPR_bEoSAkrZMaAnUEw5jnBEDdawFCsJmwsHoKigCzM0AAX1OfK-qI0DAAstBBdC-aBxIFYFgjABWHYWHYS5XiaDSDWasxmAAcFn1fKC4iYsExhw11thCkC9vZ_S-rFu3AYvOVqxoZA1VpFtQFiM53JYAb53Ok7IA2v0YgBJADiMROAwAMqVMv0ALoumF--jcDT0aA6SGoFgaJilsFqupwApQ8NgsTyFhYFOKPQ5_oKdtMYdsJiMNAJYc0RT24e1xvDtVBGhoYdStDMFDFruikXikXoHe3RVdlBBgp9gbBJjiOOwo2o1poNUxzvK_lsdFRlhoJM_QHkezbSO00iov2XZKt-KC_kwiI_PQK4gXyJYimwEFQaASYwV2EYIUhDCod-h7oc2UyrEwiDQd-sHKrA0B2oiRLrJs2xPvGREDIgfrkDyzYwogbDiDoO7FIEABeiGgJqQlgk80BYEpaGwkWoKigA3KC4hsAAwt4HBTCgpQAlilT_ICsDPDptSHrZQA

### Steps to Reproduce

Slide slowly and evenly the handle of the continuous visual map.

### Current Behavior

The color of the handle is not updated to match the color of its current position. It's still violet during sliding.

### Expected Behavior

The color of the handle should be the same as the bar at the position where it is.

### Environment

```markdown
- OS: Windows 11
- Browser: Chrome 125.0.6422.113
- Framework: ECharts examples
```

### Any additional comments?

This issue happens only when sliding the handle **slowly** and **evenly**.