Legend is not displayed when name repeats

### Version

5.4.0

### Link to Minimal Reproduction

https://codepen.io/Mykhailo-codepen/pen/rNrPbeV

### Steps to Reproduce

1)create pie chart with legend
2)add data to legend with elements which has same name.

### Current Behavior

If name of legend repeats it will be omitted and only first will be shown

### Expected Behavior

All names of legend are displeyed even they repeats

### Environment

```markdown
Problem in all browsers independent of Framework
```

### Any additional comments?