Could you add test for that in https://github.com/gatsbyjs/gatsby/blob/master/packages/gatsby-transformer-remark/src/__tests__/extend-node.js ? (you would need to edit bootstrapTest function to allow passing pathPrefix there)

@pieh test added, I'm afraid I don't know how to fix the Netlify deploy step - I'm assuming that is just flaky sometimes?

Don't worry about netlify - it is flaky unfortunately - circleCi tests are one we rely on the most

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