Debian Multiple IPv6 Interfaces

I have been trying to figure out how to set up multiple IPv6 interfaces properly the “Debian” way but it seems like something is a bit broken now. Lets say I have two interfaces: eth0 and eth1. eth0 is on vlan 100 and eth1 on vlan 200. I would expect this to work in /etc/network/interfaces:

It just does not seem to work – on reboot only eth0 will come up and eth1 will only have an IPv4 address.

The only way I have managed to get it to work so far is by using a post-up/pre-down script. I have also had to set the script on eth0 and not on eth1, so the configuration would actually look like:

I will update this post if I find a neater way or if this issue is resolved in later updates.

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