diff --git a/internal/core/src/exec/expression/ExistsExpr.h b/internal/core/src/exec/expression/ExistsExpr.h
index 1fec19065f..9d646460bc 100644
--- a/internal/core/src/exec/expression/ExistsExpr.h
+++ b/internal/core/src/exec/expression/ExistsExpr.h
@@ -52,8 +52,8 @@ class PhyExistsFilterExpr : public SegmentExpr {
                       DataType::NONE,
                       active_count,
                       batch_size,
-                      true,
-                      consistency_level),
+                      consistency_level,
+                      true),
           expr_(expr) {
     }
 
diff --git a/internal/core/src/index/JsonInvertedIndex.cpp b/internal/core/src/index/JsonInvertedIndex.cpp
index c015f77d49..65a037bc3d 100644
--- a/internal/core/src/index/JsonInvertedIndex.cpp
+++ b/internal/core/src/index/JsonInvertedIndex.cpp
@@ -97,6 +97,7 @@ template <typename T>
 void
 JsonInvertedIndex<T>::LoadIndexMetas(
     const std::vector<std::string>& index_files, const Config& config) {
+    InvertedIndexTantivy<T>::LoadIndexMetas(index_files, config);
     auto fill_non_exist_offset = [&](const uint8_t* data, int64_t size) {
         non_exist_offsets_.resize((size_t)size / sizeof(size_t));
         memcpy(non_exist_offsets_.data(), data, (size_t)size);
@@ -138,8 +139,16 @@ JsonInvertedIndex<T>::LoadIndexMetas(
             fill_non_exist_offset(non_exist_offset_codec->PayloadData(),
                                   non_exist_offset_codec->PayloadSize());
         }
+        return;
     }
-    InvertedIndexTantivy<T>::LoadIndexMetas(index_files, config);
+
+    // Fallback: no non_exist_offset_file found. This occurs in two scenarios:
+    // 1. Legacy v2.5.x data where non_exist_offset_file doesn't exist
+    // 2. All records are valid (no invalid offsets to track)
+    //
+    // Use null_offset_ as the source for non_exist_offsets_ to maintain
+    // backward compatibility. This ensures Exists() behaves like v2.5.x IsNotNull().
+    non_exist_offsets_ = this->null_offset_;
 }
 
 template <typename T>