I don't really follow, what's the issue with that? The two nodes will encrypt using the same key, so they can snoop at each other's traffic that they send out? Doesn't sound that big of a deal per se.
A nonce is not a key, it's a piece of random that is meant to be used at most once.
If an attacker sees valid nonces on a VM, and knows of another VM sharing the same nonces, then your crypto on both* VMs becomes vulnerable to replay attacks.
