V1.12.2 issue with a few nodes that used to work

I have about 40 nodes connected across the US using a single Zerotier network of I started to update a couple of nodes to v1.12.2 with nothing else changing (no firewall changes, no LAN changes, nothing - just the client update). I now have a couple of nodes that will no longer talk to each other. The strange thing is, node A will not talk to Node B, but Node B can talk to everyone else and node A can talk to other Nodes as well. The only difference is Node A client was updated to v1.12.2. Any ideas or tips I could try? Thanks.