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
41566 CLOS DUPL nor Sisyphus plasma5- zerg m plasma5-workspace: не добавляется /etc/kf5/xdg в $XDG_CONFIG_DIRS, если $XDG_CONFIG_DIRS уже выставлена в =/etc/xdg

File a new bug in the "plasma5-workspace" component of the "Sisyphus" product