Fallback read the peer list by exact key, so a partner whose tailnet name differs by one character rendered as UNREACHABLE

Plugin/unraid/include/fallback.php

@@ -167,8 +167,10 @@ function vv_fb_all(): array {
     $nodes = [];
     foreach ($hosts as $slot => $hostname) {
         $isMe   = ($slot === $currentHost || $currentHost === 'unknown');
-        $tsLabel = strtolower($hostname);
+        // Exact-key only, until now — see vv_pt_peer_lookup(). This mesh's conf name and tailnet
-        $ts      = $tsPeers[$tsLabel] ?? ['online' => null, 'active' => false, 'ip' => null];
+        // name differ by one character, so HOST2 missed every lookup and the page rendered a
+        // partner that was up the whole time as state=UNREACHABLE.
+        $ts      = vv_pt_peer_lookup($tsPeers, $hostname);
         $ip      = $ts['ip'] ?? null;
 
         // State

Plugin/unraid/include/partnership.php

@@ -187,6 +187,29 @@ function vv_pt_ts_peers(): array {
     return $peers;
 }
 
+// Resolve one host's peer record out of vv_pt_ts_peers().
+//
+// The tailnet name and the OS hostname are not the same string, and nothing keeps them in step:
+// this mesh has master.conf saying "unRAID-Jayred36" while the tailnet device is
+// "unraid-jayred365". An exact-key lookup finds nothing, and every consumer that did one showed
+// a live partner as dark — the Partnership cards until that was fixed inline, and the Fallback
+// page for as long as it has existed, where the miss became state=UNREACHABLE.
+//
+// Exact key first, then a single unambiguous prefix match in either direction. One candidate or
+// none — server1 must never resolve to server10 because it happens to share a prefix, and this
+// is never similarity scoring. Same rule as vv_resolve_tailscale_ip(), which applies it to
+// `tailscale status` text rather than to the parsed peer array.
+function vv_pt_peer_lookup(array $tsPeers, string $hostname): array {
+    $label = strtolower($hostname);
+    if (isset($tsPeers[$label])) return $tsPeers[$label];
+
+    $cand = [];
+    foreach ($tsPeers as $peerName => $peer) {
+        if (str_starts_with($peerName, $label) || str_starts_with($label, $peerName)) $cand[] = $peer;
+    }
+    return count($cand) === 1 ? $cand[0] : ['online' => null, 'active' => false, 'ip' => null];
+}
+
 // ── SSH helper — run a single command on a remote host ────────────────────────
 
 // Multiplexed, because this page makes several of these per render — a state read per partner,
@@ -457,18 +480,7 @@ function vv_pt_nodes(): array {
         //
         // Same rule as vv_resolve_tailscale_ip(), and the same refusal: one candidate or none.
         // server1 must never resolve to server10 because it happens to share a prefix.
-        $tsLabel = strtolower($hostname);
+        $ts = vv_pt_peer_lookup($tsPeers, $hostname);
-        $ts = $tsPeers[$tsLabel] ?? null;
-        if ($ts === null) {
-            $cand = [];
-            foreach ($tsPeers as $peerName => $peer) {
-                if (str_starts_with($peerName, $tsLabel) || str_starts_with($tsLabel, $peerName)) {
-                    $cand[] = $peer;
-                }
-            }
-            if (count($cand) === 1) $ts = $cand[0];
-        }
-        if ($ts === null) $ts = ['online' => null, 'active' => false, 'ip' => null];
 
         // Fallback state
         $fbState = 'UNKNOWN';