Files.newDirectortyStream specifies "The Path objects are obtained as if by resolving the name of the directory entry against dir". If the path to the directory is a relative path then the Path objects created for the entries in the directory should also be relative. The zip file system provider doesn't implement this correctly, e.g.

Path dir = zipfs.getPath("META-INF");
Files.list(dir).forEach(System.out::println)

will print absolute paths (/META-INF/MANIFEST.MF for example) when it should print relative paths.