Sat Oct 23 2021 14:30:17 UTC
It's not a bug. It's an undocumented feature.
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ID Product Comp Assignee Status Resolution Summary Changed
59204 POI XSSF dev RESO DUPL InvalidFormatException while opening XLSX file 2016-03-21
One bug found.

as

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