torrc : ClientOnionAuthDir after include directives breaks client to v2 services

If I append these two statements to torrc, in this order :

ClientOnionAuthDir /etc/tor/auth/ %include /etc/tor/torrc.d/

and restart tor.service, I can connect to 1 × v3 and 4 × v2 services, within seconds.

But if I reverse their order ( %include first ), I can only connect to the v3 service -- all other connections will eventually time out.

In man, I missed to find any recommandation about ordering these statements.

( this is on Debian Stretch with torproject's stretch repo )

Thanks!

Trac:
Username: xaho