cups-browsed wants to start avahi though disabled in conf

cups-browsed wants to start avahi though that's decativated in
/lib/systemd/system/cups-browsed-service:

---
[Unit]
Description=Make remote CUPS printers available locally
Requires=cups.service
After=cups.service avahi-daemon.service
# Wants=avahi-daemon.service

[Service]
ExecStart=/usr/sbin/cups-browsed

[Install]
WantedBy=multi-user.target
---

As we have disabled avahi-daemon avahi-dnsconfd through systemd our logs get flooded with:

May 19 16:09:23 XXXXX dbus-daemon[1044]: [system] Activating via systemd: service name='org.freedesktop.Avahi' unit='dbus-org.freedesktop.Avahi.service' requested by ':1.78' (uid=0 pid=1185 comm="/usr/sbin/cups-browsed " label="/usr/sbin/cups-browsed (enforce)")
May 19 16:09:23 XXXXX dbus-daemon[1044]: [system] Activation via systemd failed for unit 'dbus-org.freedesktop.Avahi.service': Unit dbus-org.freedesktop.Avahi.service not found.

# apt-cache policy cups-browsed
Installiert: 1.20.2-0ubuntu3.1

# lsb_release -rd
Description: Ubuntu 18.04.4 LTS

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: cups-browsed 1.20.2-0ubuntu3.1
ProcVersionSignature: Ubuntu 4.15.0-99.100-generic 4.15.18
Uname: Linux 4.15.0-99-generic x86_64
NonfreeKernelModules: nvidia_modeset nvidia
ApportVersion: 2.20.9-0ubuntu7.14
Architecture: amd64
Date: Tue May 19 15:43:38 2020
MachineType: TAROX Basic PC System
Papersize: a4
ProcEnviron:
 TERM=xterm-256color
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=de_DE.UTF-8
 SHELL=/bin/bash
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.15.0-99-generic root=UUID=25a1fdf8-5d8e-450f-b201-9362b992a217 ro
SourcePackage: cups-filters
UpgradeStatus: Upgraded to bionic on 2018-09-27 (599 days ago)
dmi.bios.date: 11/13/2019
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 2006
dmi.board.asset.tag: Default string
dmi.board.name: PRIME B450M-A
dmi.board.vendor: ASUSTeK COMPUTER INC.
dmi.board.version: Rev X.0x
dmi.chassis.asset.tag: Default string
dmi.chassis.type: 3
dmi.chassis.vendor: Default string
dmi.chassis.version: Default string
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr2006:bd11/13/2019:svnTAROX:pnBasicPCSystem:pvr032020:rvnASUSTeKCOMPUTERINC.:rnPRIMEB450M-A:rvrRevX.0x:cvnDefaultstring:ct3:cvrDefaultstring:
dmi.product.family: To be filled by O.E.M.
dmi.product.name: Basic PC System
dmi.product.version: 032020
dmi.sys.vendor: TAROX
modified.conffile..etc.cups.cups-browsed.conf: [modified]
mtime.conffile..etc.cups.cups-browsed.conf: 2019-07-31T12:09:51.536133