Tue May 17 2022 21:49:07 UTC
It's not a bug. It's an undocumented feature.
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ID Product Comp Assignee Status Resolution Summary Changed
48666 POI HSSF dev RESO DUPL Excel outlining 2011-06-24
One bug found.

as

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