I just experienced this bug in dhcp-server-4.3.6-45.el8.x86_64.rpm frpm
centos8
The dhcommon-
getifaddrs.patch patch based on
https://sources.debian.org/patches/isc-dhcp/4.3.5-3+deb9u1/dhcommon-getifaddrs.patch/
was produced by redhat and appears to now be merged in to 4.3.6
i extracted the src rpm and the dhcp-4.3.6.tar.gz in turn - the changes
to discover.c have been applied.
so it seems that this bug is now merged upstream.
So in ipv6 if there is an alias interface with no ipv6 address (i.e.
eth0:0) configured the entire interface (i.e. eth0) will be silently
ignored.
Fun
Dean