dependency proxy error

npm error:

npm warn deprecated intersection-observer@0.10.0: The Intersection Observer polyfill is no longer needed and can safely be removed. Intersection Observer has been Baseline since 2019.
npm error code E404
npm error 404 Not Found - GET https://api.main.devguard.org/chalk/-/chalk-5.6.2.tgz
npm error 404
npm error 404  The requested resource 'https://registry.npmjs.org/chalk/-/chalk-5.6.2.tgz' could not be found or you do not have permission to access it.
npm error 404 This package name is not valid, because 
npm error 404  1. name can only contain URL-friendly characters
npm error 404
npm error 404 Note that you can also install from a
npm error 404 tarball, folder, http url, or git url.
npm error A complete log of this run can be found in: /Users/larshermges/.npm/_logs/2026-09-02T09_09_32_192Z-debug-0.log

backend log:

2026-09-02T11:09:34+02:00 9:09AM DBG dependencyfirewall/controller.go:125 Fetching from upstream proxy=npm url=https://registry.npmjs.org/sanitize-html bodyPresent=false
2026-09-02T11:09:34+02:00 9:09AM DBG dependencyfirewall/controller.go:125 Fetching from upstream proxy=npm url=https://registry.npmjs.org/next bodyPresent=false
2026-09-02T11:09:34+02:00 9:09AM ERR middlewares/server.go:73 code=404, message=Not Found method=GET path=/chalk/-/chalk-5.6.2.tgz/
2026-09-02T11:09:34+02:00 9:09AM ERR middlewares/server.go:73 code=404, message=Not Found method=GET path=/chalk/-/chalk-5.6.2.tgz/
2026-09-02T11:09:34+02:00 9:09AM INF middlewares/logging_middleware.go:34 handled request method=GET url=/api/v1/dependency-proxy/npm/dompurify/ status=200 duration=75.273575ms

Start at dependencyfirewall/controller.go:125 and inspect the request path through middlewares/server.go:73 for the npm tarball request shown in the logs. Reproduce the chalk 5.6.2 fetch, then verify that the dependency proxy returns the package successfully and that npm install no longer receives the 404 response.