Tue Oct 22 2019 16:41:30 UTC
It's not a bug. It's an undocumented feature.
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ID Product Comp Assignee Status Resolution Summary Changed
62004 POI XSSF dev RESO DUPL get math formula using CTDrawing.getOneCellAnchorArray().xmlText() messy code 2018-01-17
61988 POI POI Over dev RESO DUPL POI depends on Apache xmlbeans which has been EOL since 2014 2018-01-10
61921 POI XSSF dev RESO DUPL build error while using jar 3.17 version with android 2017-12-27
61494 POI XSSF dev RESO DUPL Updating meta properties in xlsm/xlsx corrupted equation 2017-09-22
59428 POI XSSF dev RESO DUPL Xml Beans 2.6 exception with Excel creation on Android 2016-05-04
59195 POI XSSF dev RESO DUPL POIXMLTypeLoader depends on XMLBeans 2.6.0 2016-08-13
58247 POI XSSF dev RESO DUPL Some UTF-16 characters are not handled correctly (likely surrogate pair related) 2017-09-21
54084 POI XSSF dev RESO DUPL Some Unicode chars(e.g chinese chars) are not written corectly in xlsx file. 2017-09-21
8 bugs found.

as

File a new bug in the "POI" product