Sun Jan 19 2020 06:51:27 UTC
It's not a bug. It's an undocumented feature.
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ID Product Comp Assignee Status Resolution Summary Changed
63421 POI XDDF dev NEW --- An XDDFScatterChartData chart with a single series and default formatting has non-uniform formatting 2019-05-11
One bug found.

as

File a new bug in the "XDDF" component of the "POI" product