I tried different interfaces, V9 and IPFIX, and while searching for the issue I saw it's the same in other user's report although they asked about other things.
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{ last_switched: 25033130,
first_switched: 25033130,
in_pkts: 3,
in_bytes: 408,
input_snmp: 0,
output_snmp: 9,
ipv4_src_addr: '192.168.140.1',
ipv4_dst_addr: '255.255.255.255',
protocol: 17,
src_tos: 0,
l4_src_port: 44124,
l4_dst_port: 5678,
ipv4_next_hop: '255.255.255.255',
dst_mask: 0,
src_mask: 0,
tcp_flags: 0,
in_dst_mac: '000000000000',
out_src_mac: '4e5e0c66a927',
postNATSourceIPv4Address: '192.168.140.1',
postNATDestinationIPv4Address: '255.255.255.255',
postNAPTSourceTransportPort: 44124,
postNAPTDestinationTransportPort: 5678,
fsId: 256 }