[Bug] Axis Pointer for connected charts with null values dosen't sync properly between charts

### Version

5.5.0

### Link to Minimal Reproduction

https://codepen.io/Sarra-Khazri/pen/GRadZpX
### Steps to Reproduce

1. Hover on each points in chart 1 and chart 2 to see the behavior of axis pointer

### Current Behavior
**from chart1*
- if i hover on chart 1 with x= 20-06-2023 the axis pointer is syncing https://codepen.io/Sarra-Khazri/pen/GRadZpX
- if i hover on chart 1 with **x= 21-06-2023 the axis pointer not syncing**
- if i hover on chart 1 with **x= 22-06-2023 (1 null value) the axis pointer is syncing**

**from chart2**
### Expected Behavior

- The Axis pointer sync between the two charts when there is one series that have value different of null

### Environment

```markdown
- OS:windows
- Browser: chrome
- Framework: Angular 17
```

### Any additional comments?

it seems like when there is null value in serie the point after that the axis pointer dosent sync.