Your reasoning is excellent -- it's only your basic assumptions that are wrong. ...
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ID Status▲ Resolution Sev Product Comp Assignee▲ Reporter Summary
3374 CLOS DUPL min Sisyphus tetex ldv d.g.samsonenko textcase.sty: \MakeTextUpper(Lower)case and not needed space

File a new bug in the "tetex" component of the "Sisyphus" product