Should we be worried?
No, this is a classic Google update whose goal is not to penalize sites, but to promote the best content. In other words, if you see a drop, it is because other content is now considered more relevant than yours.
Beyond Core and Spam Updates, remember that Google launches thousands of updates per year to meet the expectations of its users. A few months ago, John Mueller mentioned the figure of 4,700 annual updatesfrom more than 700,000 tests.