Tue Apr 7 2020 20:07:36 UTC
It's not a bug. It's an undocumented feature.
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ID Product Comp Assignee Status Resolution Summary Changed
8593 POI HSSF dev RESO DUPL FORMULAS -- Strange bug with Formulas 2004-11-16
One bug found.

as

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