> If you know I've reported a bug, why would you deliberately not tell me that it has been fixed?
Sounds like a typical fallacy of end-users looking at software. Assuming that the developer deliberately is denying you a feature, rather than having simply not spent the engineering time to make it possible.
In this case, for instance, it could be that the pipeline to get from external feedback channels to Google's internal bug-trackers very one-way and its hard to go back. Or, there's a disconnect between when the fix ships and when the ticket is closed, and keeping track of the entire chain of data requires some work. Or, there's no easy distinguishing features on bugs that came externally to make them easily identifiable once fixed. Or, there's no process yet for an automated response that says the bug is fixed (should it provide more detail). Etc.