Solved what to check? no IPV6 pings between nodes on the same switch

I have setup 3 nodes on a fresh Freebsd 13.1-RELEASE-p1. They have the same gateway and IPS are in same /64. All 3 nodes are on the same switch (mikrotik) and same vlan untagged.

I can ping them from an external machine through the router/gateway but the nodes can't ping each others. When I run `ndp-a` it only return the gateway and the node ipv6 (+ their libks) but not the ips of the other nodes.

Previously these nodes wee under linux and were able to ping each others.

What could be the issue? What do I need to check?

Configuration is pretty straightforward:

Code:
hostname="node1.domain.tld"
keymap="fr.macbook.kbd"
ifconfig_ql0=""
ifconfig_ql0_ipv6="inet6 <PREFIX>::11/64"
ipv6_defaultrouter="<PREFIX>::1"
sshd_enable="YES"
ntpd_enable="YES"
# Set dumpdev to "AUTO" to enable crash dumps, "NO" to disable
dumpdev="AUTO"
zfs_enable="YES"

Others machines are `<PREFIX>::12`, `<PREFIX>::13`
 
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