systemd does not like to run with newer kernels if there are new capabilities...
root@buster:~ # systemctl show dnsmasq >/dev/null; echo $? Failed to parse bus message: Invalid argument 1
I really like that software. NOT.
Quick fix for Debian Buster/Backport's /usr/lib/python3/dist-packages/ansible/modules/system/systemd.py (Ansible 2.9.6)
Fixes should go into Ansible 2.10.4 and 2.9.16.