$ curl "http://en.wikipedia.org/w/api.php?format=json&action=opensearch&search=Template:Wikipedia:About&suggest="
["Template:Wikipedia:About",[]]
$ curl "http://en.wikipedia.org/w/api.php?format=json&action=opensearch&search=Template:Project:About&suggest="
["Template:Project:About",["Wikipedia:About","Wikipedia:ABOUTSELF","Wikipedia:About Fair Use","Wikipedia:About the Sandbox","Wikipedia:About essay searching","Wikipedia:ABOUTEVERYTHING","Wikipedia:About DramaQueenipedia","Wikipedia:About translating German Wikipedia","Wikipedia:About page view statistics","Wikipedia:About template mania"]]
Project:About returns seemingly correct results, but Wikipedia:About does not.
It's a bit weird that it manages to convert Project even though it's not the namespace (Template is), but misses the correct results.
Version: wmf-deployment
Severity: normal
See Also:
https://bugzilla.wikimedia.org/show_bug.cgi?id=22773
https://bugzilla.wikimedia.org/show_bug.cgi?id=40210