I have not seen this issue myself, and I have seen various customers with LACP. personally what I would do is run vSAN on the network which doesn't use LACP, just to test it and see how it behaves. That way you can rule out the NVMe devices as the issue at least. If it does perform without LACP you know the network configuration is problematic. Difficult to say why that is though, that would require more troubleshooting.