Network wide there are today only 307 of such tags.
I don't think this bug needs immediate fixing but the query can be used to find tags that have no wiki but maybe deserve it.
Here is the multi-db query to get those results:
declare @sql nvarchar(max)
create table #result (site sysname
, hostname sysname
, tagname nvarchar(150)
, wid integer
, eid integer)
select @sql = N'insert into #result' + STRING_AGG(concat(N'
select ''', name ,N''' as site
, ''',hostname ,N'''
, t.tagname
, wikipostid
, excerptpostid
from ', quotename(name), N'.dbo.tags t
left outer join ', quotename(name), N'.dbo.posts pw on t.wikipostid = pw.id
left outer join ', quotename(name), N'.dbo.posts pe on t.excerptpostid = pe.id
where len(pe.body) = 0
and len(pw.body) = 0
and [count] = 1
'),N'
union all')
from (select convert(nvarchar(max),name) name
-- , convert(nvarchar(max),sitename) sitename
-- , meta
-- , domain
, concat(
-- based on an idea from Glorfindel
(case sitename
WHEN 'Audio' THEN 'video'
WHEN 'Beer' THEN 'alcohol'
WHEN 'CogSci' THEN 'psychology'
WHEN 'Garage' THEN 'mechanics'
WHEN 'Health' THEN 'medicalsciences'
WHEN 'Moderators' THEN 'communitybuilding'
WHEN 'Photography' THEN 'photo'
WHEN 'Programmers' THEN 'softwareengineering'
WHEN 'Vegetarian' THEN 'vegetarianism'
WHEN 'Writers' THEN 'writing'
WHEN 'Br' THEN 'pt'
WHEN 'Mathoverflow' THEN concat((meta+'.'), sitename)
ELSE case when sitename = domain then null else sitename end
end +'.')
, (case
when sitename <> 'mathoverflow' then (meta+'.')
else null
end)
, (case
when sitename <> 'mathoverflow' then concat((domain + '.'), 'com')
else 'net'
end)
) hostname
from (
select name
, case parsename(name,1)
when 'Meta' then parsename(name,2)
else parsename(name,1)
end [sitename]
, case parsename(name,1)
when 'Meta' then 'meta'
else null
end [meta]
, coalesce(parsename(name,3), parsename(name,2)) [domain]
from sys.databases
where database_id > 5
-- (name not like '%.Meta' or name = 'StackExchange.Meta')
) dbs
) dbsall
exec (@sql)
select site
, concat(N'https://', hostname, '/tags/', tagname, N'/info|', tagname) [single-use]
from #result
Keep in mind SEDE is only updated once a week, on Sunday.