Tue Jul 27 2021 13:20:23 UTC
Oh...is this a bug now??!!! It was called a change request the last time I checked!
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ID Product Comp Assignee Status Resolution Summary Changed
52186 POI XSSF dev RESO FIXE groupColumn with setColumnWidth not working 2013-09-05
55294 POI XSSF dev RESO FIXE [PATCH] Make POI producing <col> elements compatible with MS Excel 2013-08-05
2 bugs found.

as

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