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The OPC UA traffic is running on port 51234. Use either Analyze -> Decode As... to add a TCP Port entry for port 51234 with the decoding set to "OpcUa" or set the OpcUa port preferences to include 51234 (the file can support multiple ports, comma separated).

Unfortunately there is also MongoDB traffic using 51234 as a source port for the client which may be confusing things. The OPC UA traffic appears to be between hosts and .115 so you can use a display filter of "ip.addr ==" to see all the relevant traffic or "OpcUa" once you have set the "Decode As ..."