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Hi there,
As far as I know, DigitalOcean VPC private networking is IPv4 only. The VPC isn’t a shared L2 segment, so IPv6 multicast like RA/ND to ff02::1 on the private interface won’t be delivered. That’s why your ULAs on eth1 don’t get advertised or reachable.
Seems to be listed as a limitation here: https://docs.digitalocean.com/products/networking/ipv6/details/limits/
Instead, you could use public IPv6 on the primary interface and route over that, stick to IPv4 on the VPC.