Keycloak clustering in 21.1.1 vs 20.x.x

I upgraded my dev env from 20.x.x to latest 21.1.1 but the clustering using UDP isn’t happy with the following settings:


As far as I can tell, removing them, disable cluster and enable it again, works without those settings, but I can’t find a reason why those are gone and not supported anymore, and it is not related to the openJDK bug in 17 and 19 since we are testing with openJDK11 as well