Hi Highcharts Team,
I believe I’ve encountered a possible issue when using collapsible Gantt layers with the yAxis scroll bar.
I was able to reproduce the problem using an example from your site by adding a yAxis scroll bar:
https://jsfiddle.net/zepdknxc/
Steps to reproduce:
1- Collapse the last collapsible layer.
2- Scroll down the chart multiple times using the yAxis scroll bar.
Could you please assist me in identifying how to avoid or resolve this issue?
Regards,