Are you comparing a single "get-next" with a single "get", or are you generating "get-next" with "snmpwalk" on a full table?
In the second case, what you are seeing is expected. To reduce the CPU load, the SCE by default ignores UDP flows with less than 4 packets and the SNMP GET only generates 2 packets.
If this is important for you, you can add port 161 (default SNMP queries port) as an exception so that the SCE opens a flow when seeing only 2 packets.
Go to "Configuration > Policies > System Settings... > Advanced Options > Advanced Service Configuration Options... > add "161" to the list of "UDP ports for which flow should be opened on first packet""
You confirm that you are using the default port for SNMP?
Are the 2 packets of the flow (GET and RESPONSE) going through the same SCE?
As a test, could you create an empty service configuration, only updating "UDP ports for which flow should be opened on first packet" and enable Transaction Usage RDR, push that service policy to the SCE and see if it works then?
If none of these helps, I would suggest you to open a TAC service request.
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