The changelog generator is configured like this:
https://github.com/atlassian/changesets/blob/6353abf925d13c41feb1884124ddb5edc8c33555/.changeset/config.json#L2-L5

This has the unfortunate effect of specifying an implicit dependency for the @changesets/cli (and @changesets/apply-release-plan) which cannot be resolved when running changesets using tools like npx. The resolving happens here:
https://github.com/atlassian/changesets/blob/6353abf925d13c41feb1884124ddb5edc8c33555/packages/apply-release-plan/src/index.ts#L209

cc @JakeGinnivan