Thu Aug 5 2021 12:33:50 UTC
It's not a bug. It's an undocumented feature.
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ID Product Comp Assignee Status Resolution Summary Changed
60042 POI XSLF dev RESO DUPL PartAlreadyExistsException thrown when removing and adding slides. 2017-03-19
One bug found.

as

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