As part of the release process, this was staged: https://repository.apache.org/content/repositories/maven-110/org/apache/maven/apache-maven/3.1.0/
Notice that unpacking with tar xzpf which preserves the file permissions reveals that some directories are have correct permissions (e.g. /bin) while others do not (e.g. /conf). Here is the full list of badly set permissions:
These should be 775 for directories and 664 for files.