Version

5.0.1

Reproduction link

https://jsfiddle.net/x4Lf09tm/

Steps to reproduce

Set the text shadow on visualMap:

visualMap: {
  textStyle: {
    color: '#000',
    textShadowColor: '#000',
    textShadowBlur: 2,
  }
}

What is expected?

The text has shadow on it.

What is actually happening?

No shadow on the text.