How to prevent notifications when updating old content (blog posts)

Our community has private groups and after joining, members are automatically subscribed to our News blog. Yesterday, we made an edit on a post from 2 years ago and an email notification was sent to 4,000+ members. Our community is predominantly professionals and of course the blog post title had to have "NEW eBook" so tons of members clicked on the email. 

We recently upgraded to V11 but this is the first time I've seen where a notification was created from making an edit. Has anyone else experienced this? For now, we're disabling the notification plugins when editing old content but this is not a good solution. 

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