Mdns avahi errors in network

Since some time (~months) i encounter strange error messages on all linux-boxes in my home network:

Feb 14 18:04:56 philip-desktop avahi-daemon[909]: avahi_normalize_name() failed.
Feb 14 18:05:00 philip-desktop avahi-daemon[909]: avahi_normalize_name() failed.
Feb 14 18:05:02 philip-desktop avahi-daemon[909]: avahi_normalize_name() failed.
Feb 14 18:05:02 philip-desktop avahi-daemon[909]: avahi_normalize_name() failed.

I see these error messages on all computers running linux in my network.
Firing up wireshark, i see that these error correlate with certain mdns-packets from my homeassistant-os box:
image

Has anyone else encountered this behaviour? And does anyone know how to stop this?

(I am not completely sure, if this is a problem of home-assistant OS or of home-assistant core. If this is the wrong category, please tell me)

br,
Philip