Please update tcpdump in the UTM.
The current version in 9.101-12 is 3.9.8, and the current version on my not-newly-installed Ubuntu desktop (as an example) is 4.2.1.
That's quite a discrepancy, and there are at least two useful features which we are precluded from using because of this ("-G" and "-z", and others).
Please update tcpdump in the UTM to a more recent version.
I have attempted to copy the binary over, but this alone was insufficient.