I don't know anything about this bug other than I've never been able to search for a hash tag on any mediawiki-based site. Semantic mediawiki, and related extensions, make extensive use of hash tags and search for documentation of them is virtually impossible if the keyword part of it is not something fairly unique like "arraymap" (for #arraymap). Searching for one like "ask" (for #ask) just can't be done due to the number of false hits.
Version: 1.21.x
Severity: enhancement