restore doesn't preserve directory mtimes with "backup on restore" option

[protist]

I just did a restore, and I realised that modification times of directories were not preserved. I checked the rsync command, and I realised that it is because backintime uses the --backup flag when restoring. From man rsync:

-b, --backup ... Note that if you don’t specify --backup-dir, (1) the --omit-dir-times option will be forced on

I'm not sure why that is; it doesn't make sense to me. In any case, my expectation was that backintime would preserve all modification times. Obviously I can see the merit of using --backup in general, but when restoring directories, I'd rather manually rsync -a instead, which is less convenient, but preserves all modification times.