Inspecting the contents of a code file creates the modules contained in that file. Probably this true for opening a code browser on the package. Yup it does!
Fix: Delete the spurious module.
Fixed with commit https://hg.sr.ht/~cy-de-fect/HaverOnCuis/rev/9903bb35d7037ca146a9e03796cf46d967c5f7f1