If one manually removes adds or removes subscribers from a newsletter, the "subscriber count" column on Special:Newsletters becomes out of sync with the actual number of subscribers.
Well, I see that the counts are getting updated on all sub/unsub from http://newsletter-test.wmflabs.org/wiki/Special:Newsletters -- and due to our application limitations of course, we cannot update this on real time when you have it done on say a seperate tab on http://newsletter-test.wmflabs.org/wiki/Special:Newsletter/2/subscribe.
@Pppery should give more information, or I close this one as invalid.
This task is looking a bit more complicated than I had originally reported it as.
1: Submitting the manual subscribers form removing only one user does not change the subscriber count field at all
2: Submitting the manual subscribers form with no changes increases the subscriber count by 1
3: Sumbitting the manual subscribers form adding more than one user only increases the subscriber count by 1
... and a few other wrinkles I've missed somewhere
One question, does the number of subscribers get out of sync after adding/removing someone manually only temporarily and then re-syncs, or are manual removals/additions cause the number of subscribers to become false, permanently out of sync?
If it is the first case, I think it is OK. What matters is that the number of subscribers is correct, say, after 24 hours max.
If it is the second case, then this is a serious bug.