It could lead to duplicated content getting indexed. More info: [Reasons to choose a canonical URL](https://developers.google.com/search/docs/advanced/crawling/consolidate-duplicate-urls#why-it-matters) Plugins that could fix this issue: - [gatsby-plugin-canonical-urls](https://www.gatsbyjs.com/plugins/gatsby-plugin-canonical-urls/) - [gatsby-plugin-react-helmet-canonical-urls](https://www.gatsbyjs.com/plugins/gatsby-plugin-react-helmet-canonical-urls/) - [gatsby-plugin-clean-canonical-urls](https://www.gatsbyjs.com/plugins/gatsby-plugin-clean-canonical-urls/)