We are seeing stack total labels get cut off as they get close to the top bounds of the chart. While investigating this we found that we can crop & allow overlap on datalabels so they show outside the bounds of the table, but cannot do that with the stacked labels. We would like to have the same crop and overflow options that datalabels have on stack labels.

https://api.highcharts.com/highcharts/series.line.dataLabels.crop
https://api.highcharts.com/highcharts/yAxis.stackLabels has allowOverlap but that doesn't exactly meet our needs.