Comment 4 for bug 1684854

Seems this lines of code are responsible:

src/dns/nm-dns-systemd-resolved.c:

static void
add_domain (GVariantBuilder *domains,
            const char *domain,
            gboolean never_default)
{
 /* If this link is never the default (e.g. only used for resources on this
  * network) add a routing domain. */
 g_variant_builder_add (domains, "(sb)", domain, never_default);
}

So someone actually wanted this behavious. The question is "why"? I definitly want to use my VPN only for resources on that network and yes I want to resolve the internal names of this network using a search domain.