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
38919 NEW --- nor Sisyphus rpm-buil vseleznv darktemplaralt Сборочница не должна пропускать в noarch пакеты с excludearch или exclusivearch

File a new bug in the "rpm-build" component of the "Sisyphus" product