If I open wikidata.org with clean environment and go to Special:Search and search, I get lots of namespaces searched, including talk namespaces, etc.
Not sure if it's intentional or not, but the consequences are: for the user with default settings:
- They do not get specialized Wikidata search (no languages support, no highlighting, etc. - almost all the features we've worked for Wikidata search are not used)
- Talk spaces are searched together with article spaces - meaning index optimizations for splitting talk and article spaces are not used and search is run in slowest mode possible.
- A lot of spaces are searched that common user would not be interested in - Template, etc.
We need to figure out why it happens, whether it is intentional and fix it.