FAI and invoke-rc.d: policy-rc.d denied execution of restart

Wed Jul 5 23:24:20 CEST 2017

In doing an FAI build of stretch we are seeing several messages of the form

Running in chroot, ignoring request.
invoke-rc.d: policy-rc.d denied execution of restart.

For example:
########################
...
Setting up libmagic1:amd64 (1:5.30-1) ...
Setting up rsync (3.1.2-1) ...
Running in chroot, ignoring request.
invoke-rc.d: policy-rc.d denied execution of restart.
Created symlink 
/etc/systemd/system/multi-user.target.wants/rsync.service â†’ 
/lib/systemd/system/rsync.service.
Setting up tmpreaper (1.6.13+nmu1+b2) ...
...
########################

What does this error message mean? Can it be safely ignored?