ICX 7450 won't pass traffic to a Mellanox SN3420M

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Installing a pair of new Mellanox SN3420M switches

Cross connecting them to an existing stack of ICX 7450 using an LACP etherchannel of 2x 10gb fiber links

Etherchannel comes up, but won't pass any traffic.

Ruckus T1 + nvidia support confirm the configuration is correct, VLAN settings are the same on both sides, LAG group comes up active/active, packets are flowing but can't get any VLAN traffic over the link.

Tried a single non-etherchannel link, same issue.

Anyone run into this before?

Can anyone confirm if there's a firmware upgrade to fix this before we call another weekend outage?

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