Reference Line text is cut off in Bar Chart

The best solution would be to raise support ticket as suggested by Stewart. But alternate quick solution  would be if you can give label to your columnChartField.

a!columnChartField(
label: "Heading",
labelPosition: "ABOVE",
categories: {"Stage 1", "Stage 2", "Stage 3", "Stage 4", "Stage 5", "Stage 6", "Stage 7"},
series: a!chartSeries(
label: "# Opportunities",
data: a!forEach(
items: enumerate(7) + 1,
expression: with(
rand()*20+1
)
),
color: "ACCENT"
),
showLegend: false,
showTooltips: true,
referenceLines: {
a!chartReferenceLine(
label: "Level One",
value: 5
),
a!chartReferenceLine(
label: "Level Two",
value: 10
),
a!chartReferenceLine(
label: "Level Three",
value: 15
),
a!chartReferenceLine(
label: "Level Four",
value: 20
)
}
)

That's true. I will create a support ticket for this issue. 

Also, adding a header does not solve in the column or bar chart. Thanks a lot for your reply, ankushj!

That's true. I will create a support ticket for this issue. 

Also, adding a header does not solve in the column or bar chart. Thanks a lot for your reply, ankushj!