This is probably a bug in the Linux HyperV Card driver. 
Maybe it's MS job to correct this. I don't know who has responsibility on this 
But, I confirm it is not a bug in the guest hyperV system or windows. I have 
ipv6 windows servers (multiple versions) and they all work correctly with Ipv6. 
Even my HyperV Servers are on ipv6 and work fine.
On the other hand, if the bug is on Linux, but more widely that only on Hyperv 
Card driver, we would have heard about it way faster ;)
At last, changing a settings with ethtool resolves the problem is pointing the 
investigation starting point I guess.

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  Hyper-V NIC cannot pass IPv6 UDP packets by default until protocol
  offload is disabled

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