All md5 and sha1 checksums for dump files are available in dumpstatus.json for the main database dumps, except for the multistream dumps. The same information is available in the -md5sums.txt, -sha1sums.txt and their respective JSON files, but just not in dumpstatus.json.
The md5 and sha1 checksums should be added into the dumpstatus.json file for the multistream dumps. A step is probably missing here.