Slashes (`/`) in journal format or page titles create some empty pages

This is how the namespace mechanism works.
The namespace mechanism is originally proposed in This Thread
Namespace mechanism is applied on pages with slashes (/) in title. / splits title into hierarchies, so called “namespaces”.
To avoid creating the empty namespace pages, you may remove the slashes in title (or preferred journal date format), then re-index the graph. Those namespace pages would disappear if there’s no content inside.

Related: preferred journal format

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