Hello Alexis! Thanks for using rdiff-backup and reporting about https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=992325
Please test if this issue still exists in latest rdiff-backup 2.2.2-1 in Debian. If it still exists, please report the issue upstream at https://github.com/rdiff-backup/rdiff-backup and mark this Debian bug report as forwarded. Alternatively you could consider contributing to the man page upstream to at least update it to explain that this feature no longer behaves in the same way as you expected.
