diff --git a/app/src/main/java/io/legado/app/ui/config/PrefDelegate.kt b/app/src/main/java/io/legado/app/ui/config/PrefDelegate.kt
index 9d740922b..6f927dea1 100644
--- a/app/src/main/java/io/legado/app/ui/config/PrefDelegate.kt
+++ b/app/src/main/java/io/legado/app/ui/config/PrefDelegate.kt
@@ -59,6 +59,7 @@ fun <T> prefDelegate(
             // 从 DataStore 读取初始值（DS 为唯一读取源）
             scope.launch {
                 val dsValue = readFromDs()
+                android.util.Log.d("PrefDelegate", "readFromDs key=$key defaultValue=$defaultValue dsValue=$dsValue")
                 if (dsValue != null) {
                     _value.value = dsValue
                 }
@@ -127,7 +128,7 @@ fun <T> prefDelegate(
                 }
                 // 同步写入 DataStore，确保持久化后再返回
                 // 异常不阻断流程：SP 已写入，readFromDs() 会回退到 SP 读取
-                runCatching {
+                val dsResult = runCatching {
                     runBlocking(Dispatchers.IO) {
                         when (value) {
                             is String? -> DsSync.putString(key, value)
@@ -138,6 +139,7 @@ fun <T> prefDelegate(
                         }
                     }
                 }
+                android.util.Log.d("PrefDelegate", "setValue key=$key value=$value dsResult=${dsResult.isSuccess}")
                 onValueChange?.invoke(value)
             }
         }
@@ -175,8 +177,12 @@ fun <T> prefDelegate(
                 null
             }
             // DS 有值，直接返回
-            if (dsValue != null) return dsValue
+            if (dsValue != null) {
+                android.util.Log.d("PrefDelegate", "readFromDs key=$key DS hit=$dsValue")
+                return dsValue
+            }
             // DS 无值，回退到 SP（迁移遗漏时的补偿）
+            android.util.Log.d("PrefDelegate", "readFromDs key=$key DS miss, falling back to SP")
             val spValue: T? = when {
                 defaultValue is String || defaultValue == null ->
                     appCtx.getPrefString(key, defaultValue as String?) as T?
@@ -190,16 +196,19 @@ fun <T> prefDelegate(
                     appCtx.getPrefFloat(key, defaultValue) as T
                 else -> null
             }
-            // SP 有值但 DS 没有，补写入 DS 修复迁移遗漏
-            if (spValue != null && spValue != defaultValue) {
-                when (spValue) {
-                    is String? -> DsSync.putString(key, spValue)
-                    is Int -> DsSync.putInt(key, spValue)
-                    is Boolean -> DsSync.putBoolean(key, spValue)
-                    is Long -> DsSync.putLong(key, spValue)
-                    is Float -> DsSync.putFloat(key, spValue)
+            // DS 无值时，将 SP 值补写入 DS（修复迁移遗漏）
+            if (spValue != null) {
+                runCatching {
+                    when (spValue) {
+                        is String? -> DsSync.putString(key, spValue)
+                        is Int -> DsSync.putInt(key, spValue)
+                        is Boolean -> DsSync.putBoolean(key, spValue)
+                        is Long -> DsSync.putLong(key, spValue)
+                        is Float -> DsSync.putFloat(key, spValue)
+                    }
                 }
             }
+            android.util.Log.d("PrefDelegate", "readFromDs key=$key SP fallback=$spValue (defaultValue=$defaultValue)")
             return spValue
         }
     }