NOTE: Apple has confirmed that, in certain calendar views, this is expected behavior. The count is not shown to sighted users either. This bug has therefore been marked as fixed, and this message prepended to explain why.
In Calendar, Voiceover used to announce how many appointments were on a day by saying "[date], x events, list". It now just says "[date], list". There's no longer an indication of how many events are on the day you are looking at in the grid.
Bug First Encountered
How often the bug occurs
Again, this has been confirmed as intended behavior and affects sighted and blind users alike. Plus, it only happens in some views; others still show the count as expected.
For me, it says exactly as in the bug description:"[date], x events, list"