Thanks for the answers.
Actually templates are sent also for fields below that 541. I have created also an issue IPFIX templates sent by Citrix Netscaler are not cached · Issue #192 · logstash-plugins/logstash-codec-netflow · GitHub
There is a screenshot from Wireshark where can be seen that eg. template for field 256.
...and pipeline also outputs nothing if configuring an output to a file for a test.