Okay adding the suggested rule

works for me. So it would seem dhclient is treating denied access to comm as a 
fatal error.

Interestingly I also had it throw a rejection for capability sys_module

[ 1645.480546] audit: type=1400 audit(1616847221.859:73):
apparmor="DENIED" operation="capable" profile="/{,usr/}sbin/dhclient"
pid=3380 comm="dhclient" capability=16  capname="sys_module"

which should not generally be required anymore. See
https://bugs.launchpad.net/ubuntu/+source/isc-dhcp/+bug/1759032

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https://bugs.launchpad.net/bugs/1918410

Title:
  isc-dhcp-client denied by apparmor

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