To reproduce: try searching for any term on Incubator which should yield some results, e.g. "Incubator". If you have set a test-wiki preference in your preferences (the possibility comes from the Incubator extension), you will get results within that test-wiki i.e. Wx/xxx/ pages. But if you have the general maintenance setting or no setting there, the search will never find any pages.
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The extension is quite outdated due to lots of regression, so a rewrite is probably needed to bring it back up-to-date.
The description of the default user preference is to search on "All (sub)wikis". Yet, it seems in practice, this means no wikis at all.
This is affecting maintenance work on the wiki, such as searching through templates, user scripts, interface messages, gadgets, etc.
For example: insource:/MyLanguage/ returns no results, when it is probably meant to return at least https://incubator.wikimedia.org/wiki/MediaWiki:Aboutpage.
I've tried dozens of variations, including without namespace filter, and without using insource, but still no results, no matter what I try.
Change 710609 had a related patch set uploaded (by Ebernhardson; author: Ebernhardson):
[mediawiki/extensions/WikimediaIncubator@master] Don't apply title prefix filter in Special:Search for unset project
Change 710609 merged by jenkins-bot:
[mediawiki/extensions/WikimediaIncubator@master] Don't apply title prefix filter in Special:Search for unset project
This is only solved for the "None/All" preference, not for the "Maintenance" wiki preference.
Change 722678 had a related patch set uploaded (by Ebernhardson; author: Ebernhardson):
[mediawiki/extensions/WikimediaIncubator@master] Don't apply title prefix filter in Special:Search for site project
Change 722678 merged by jenkins-bot:
[mediawiki/extensions/WikimediaIncubator@master] Don't apply title prefix filter in Special:Search for site project