Customer enable NCS in following mode:

flow monitor-map Exporter

record ipv4 extended

It led to issues with date decoding:

2025-10-24 16:10:46,298 [ERROR] Invalid number of data flowsets, strange number of flows: 0

Which were caused by variable length encoding in these templates (attached image)

This information matches with official one from Cisco web site https://www.cisco.com/c/en/us/td/docs/iosxr/ncs5500/netflow/241x/configuration/guide/b-netflow-cg-ncs55k-24xx/m-netflow-supported-features.html