Inconsistent checksums available to assets under the same repo

We have noticed that some assets contain SHA1, SHA512, SHA256 and md5, while others are missing multiple types of checksum. More specifically, we have noticed this behaviour while using the Nexus API for all of our npm repos (see attached screenshot for example), and, we have noticed that assets in Docker repos only contain sha1 and sha256. We would greatly appreciate it if md5 is available in all assets, thank you.