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This is essentially a design issue. They have the likes and they still count, regardless of whether they're shown there. The only other option would be to display a placeholder to indicate that you can't view the content. (Similar issues can appear on other pages that have very varied permissions and a potentially large amount of data to consider.)

However, generally, this has been accepted as it's a very rare thing. Not only is it an uncommonly viewed page, it requires sweeping permission changes to create a noticeable situation. This would have existed since day 1 if it's been mentioned before, it's only been once or twice.