IPv6 subnet routing

[Martin]

I've been trying out IPv6 networking with tinc and noticed that it will not
route smaller segments than /48
If I try to run ip -6 route add aaaa:bbbb:cccc:dddd::/64 dev tun0 I get
network unreachable
However if I run ip -6 route add aaaa:bbbb:cccc::/48 dev tun0 it works fine

Is this is a limitation in tinc or the kernel network stack itself?
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