On the same machine as sdeziel found the problem:

root@lxd02:~# lsb_release -rd
Description:    Ubuntu 20.04.2 LTS
Release:        20.04

root@lxd02:~# apt-cache policy systemd
systemd:
  Installed: 245.4-4ubuntu3.7
  Candidate: 245.4-4ubuntu3.7
  Version table:
 *** 245.4-4ubuntu3.7 500
        500 http://archive.ubuntu.com/ubuntu focal-updates/main amd64 Packages
        100 /var/lib/dpkg/status
     245.4-4ubuntu3 500
        500 http://archive.ubuntu.com/ubuntu focal/main amd64 Packages

root@lxd02:~# uname -a
Linux lxd02 5.4.0-77-generic #86-Ubuntu SMP Thu Jun 17 02:35:03 UTC 2021 x86_64 
x86_64 x86_64 GNU/Linux

root@lxd02:~# date
Tue 29 Jun 2021 01:16:13 PM UTC

root@lxd02:~# tail -f /var/log/syslog
Jun 29 13:16:20 lxd02 dnsmasq[1896]: using nameserver 127.0.0.53#53
Jun 29 13:16:20 lxd02 dnsmasq[1896]: reading /etc/resolv.conf
Jun 29 13:16:20 lxd02 dnsmasq[1896]: using local addresses only for domain lxd
Jun 29 13:16:20 lxd02 dnsmasq[1896]: using nameserver 127.0.0.53#53
^C
root@lxd02:~# uptime
 13:16:35 up 4 min,  1 user,  load average: 0.74, 1.46, 0.74

Problem is still occuring.

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https://bugs.launchpad.net/bugs/1891215

Title:
  systemd-resolved re-creates /run/systemd/resolve/*resolv.conf for
  every IPv6 RA received

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