For HA or LACP. Both the Nodes in the Cluster should have identical configuration, inclusive of Network.
When the both port in LACP fails in the Primary node, Pool will be imported to Secondary Node and it will use the LACP of secondary node
When the Node 1 comes back into available, Pool will be imported back to Node1 from Node2 and now LACP will be used from Node1.
Below link provides more details of how HA works
It would be good if you can share the logs. We need to look into the logs/system to figure what happened during the HA Process. You can collect all the logs from the following path
Please send the logs to firstname.lastname@example.org.