Bug 1035537 - split -n k/N gives incorrect data on blocks after the first

[Chris Frey]

I'd like to give a gentle nudge to the following bug, which affects
both Bullseye and Buster:

        https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1035537

If it can be fixed in LTS, that would be great.

Thanks!
- Chris