Sat Jan 25 2020 05:09:16 UTC
It's not a bug. It's an undocumented feature.
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ID Product Comp Assignee Status Resolution Summary Changed
47855 POI HSSF dev RESO DUPL java.lang.RuntimeException: Shared Formula Conversion: Coding Error 2009-09-16
One bug found.

as

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