[08:49] <LukasM[m]> ObiWanCanOweMe: I think the "mcast-snooping" setting only works for Open vSwitch bridges at the moment.. You might want to enable that manually in a networkd-dispatcher hook (https://netplan.io/faq/#use-pre-up%2C-post-up%2C-etc.-hook-scripts)
[08:53] <LukasM[m]> or, even better: use a /etc/systemd/network/10-netplan-YOUR_BR.netdev.d/override.conf and put in the MulticastSnooping= setting (https://www.freedesktop.org/software/systemd/man/systemd.netdev.html#MulticastSnooping=)