Checksum error for multivolume files. Unrar handles it fine, no indication of file corruption

[rieje]

I've never had a problem with extracting multivolume files with unar (1.10.7) until now:

unar <compressed file>.part01.rar results in prompt for password. I enter the password then:

Failed! (Wrong checksum)
  <compressed file>/Password=thisisthepassword.txt  (0 B)... OK.
  <compressed file>/picture.jpg  (135958 B)... Failed! (Wrong checksum)
  ...

I also tried renaming <compressed file>part01.rar to <compressed>part1.rar and so on. It is a 16 part file. I don't usually deal with encrypted multivolume files (so I don't know if it's related).

File extracts fine with unrar x <compressed file>.part01.rar--I'm prompted for the password and after entering it, it asks me if I want to apply to the file being processed [Y]es, [N]o, [A]ll. I press "a" and all extracts with an "OK", no indications of checksum or any file corruption problems.