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

[skhazri]

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

- 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.

[helgasoft]

could be hacked with one additional (invisible) series - Demo. Only the tooltip needs to be customized to exclude the additional series.

[skhazri]

@helgasoft thank you for your response and for the demo, i tried the hack and it works perfecty

[skhazri]

@helgasoft i have added zoom on y axis and i have this issue when i zoom on y and the series with zero values are outside the zoom range, the chart's axisPointer will be invisible it is the same issue described #17074 . Do you have an idea if it is a bug

what i want to achieve is to have the axis pointer always visible on x axis even there is zoom y on others charts and points are not in zoom range

[skhazri]

link to demo https://codepen.io/Sarra-Khazri/pen/LYoKLaM?editors=0010

[grenobnik]

what i want to achieve is to have the axis pointer always visible on x axis even there is zoom y on others charts and points are not in zoom range

It looks like in this case, the "invisible" series should modify its value to be in the display range.