diff --git a/scripts/config/core/variables/config_scan_variables.sh b/scripts/config/core/variables/config_scan_variables.sh
index a45ac65..944dfe3 100755
--- a/scripts/config/core/variables/config_scan_variables.sh
+++ b/scripts/config/core/variables/config_scan_variables.sh
@@ -34,6 +34,53 @@ _reconcileSplitValueComment()
     fi
 }
 
+# Restore trailing columns a port descriptor has LOST, without touching any
+# value the live config already states.
+#
+# CFG_<APP>_PORT_<n> is a positional, pipe-separated row whose last three
+# columns (url_path, subdomain, recommended) are optional. The port editor used
+# to serialise only ten of them, so saving any port on an app silently dropped
+# that app's Traefik subdomain and the router quietly fell back to the app-name
+# default. Navidrome lost "music" and Speedtest lost "speedtest" exactly that
+# way, and nothing said so — the app kept working on the wrong hostname.
+#
+# The writer is fixed, but installs already carrying the damage would keep it
+# forever: reconcile preserves the user's value, and a truncated row IS the
+# user's value as far as it can tell. So top it up from the template, appending
+# only the columns the live row does not reach. Everything the live row states
+# wins, including a deliberately blanked one, so a user who cleared a subdomain
+# does not get it handed back.
+#
+# Echoes the value to use.
+_reconcilePortColumns()
+{
+    local key="$1" live_v="$2" tmpl_v="$3"
+    [[ "$key" =~ _PORT_[0-9]+$ ]] || { printf '%s' "$live_v"; return 0; }
+
+    # Values are stored quoted; compare and rebuild on the bare text.
+    local lq="" l="$live_v" t="$tmpl_v"
+    if [[ "$l" == \"*\" ]]; then lq='"'; l="${l%\"}"; l="${l#\"}"; fi
+    if [[ "$t" == \"*\" ]]; then t="${t%\"}"; t="${t#\"}"; fi
+    [[ -n "$l" && -n "$t" ]] || { printf '%s' "$live_v"; return 0; }
+
+    local -a L T
+    IFS='|' read -ra L <<< "$l"
+    IFS='|' read -ra T <<< "$t"
+    (( ${#L[@]} < ${#T[@]} )) || { printf '%s' "$live_v"; return 0; }
+
+    # Count BEFORE extending, or the message reports the post-merge width.
+    local was=${#L[@]}
+    local k
+    for (( k=${#L[@]}; k<${#T[@]}; k++ )); do L+=("${T[k]}"); done
+    local rebuilt; rebuilt="$(IFS='|'; printf '%s' "${L[*]}")"
+    # To STDERR. This function returns its result on stdout through a command
+    # substitution, so anything isNotice prints there lands INSIDE the config
+    # value — which is exactly what happened the first time, writing the notice
+    # text into navidrome's descriptor.
+    isNotice "Restored port descriptor $key from $was to ${#L[@]} columns (a truncated row had dropped its trailing column(s))." >&2
+    printf '%s%s%s' "$lq" "$rebuilt" "$lq"
+}
+
 reconcileConfigFile()
 {
     local live="$1" template="$2"
@@ -66,10 +113,14 @@ reconcileConfigFile()
             if [[ -n "${live_value[$key]+x}" ]]; then
                 # Keep the user's value, take the template's comment (so
                 # title/description/options/markers stay in sync with the repo).
+                # One exception, and it only ever ADDS: a port descriptor that
+                # has lost its trailing columns is topped up from the template.
+                local kept="${live_value[$key]}"
+                kept="$(_reconcilePortColumns "$key" "$kept" "$tmpl_value")"
                 if [[ -n "$tmpl_comment" ]]; then
-                    merged="${key}=${live_value[$key]}     ${tmpl_comment}"
+                    merged="${key}=${kept}     ${tmpl_comment}"
                 else
-                    merged="${key}=${live_value[$key]}"
+                    merged="${key}=${kept}"
                 fi
                 printf '%s\n' "$merged" >> "$tmp"
                 emitted["$key"]=1