Tue Jan 28 2020 03:05:29 UTC
Feature, not a bug !
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ID Product Comp Assignee Status Resolution Summary Changed
53209 POI XSSF dev RESO DUPL Too many styles corrupts the excel 2015-09-03
58005 POI SXSSF dev RESO DUPL Amount of CellStyles is still limited to 32K 2015-08-19
2 bugs found.

as

File a new bug in the "POI" product