Mon Jan 20 2020 11:31:16 UTC
When using your debugger, consider who the bugger was that buggered things up.
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ID Product Comp Assignee Status Resolution Summary Changed
58005 POI SXSSF dev RESO DUPL Amount of CellStyles is still limited to 32K 2015-08-19
53209 POI XSSF dev RESO DUPL Too many styles corrupts the excel 2015-09-03
2 bugs found.

as

File a new bug in the "POI" product