IPv6 problems (maybe from proxmox!)

Now I have another problem but similar to that here: Now I can reach the pfSense with the prefix:: but now the VyOS does not answer to neighbor solicitation messages. It has joined the correct multicast groups for its addresses. (solicited node multicast) but doesn´t answer to the NS messages. (But also sometimes it is answering? "exploding-head-emoji") And I think there must be some issue on the layer under that. On the bridge, multicast bridge routing?
 
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