diff --git a/src/native_execution_consumer.cpp b/src/native_execution_consumer.cpp
index f1acba9..de9194b 100644
--- a/src/native_execution_consumer.cpp
+++ b/src/native_execution_consumer.cpp
@@ -1064,7 +1064,9 @@ void NativeExecutionConsumer::invoke_callback(BacktestEngine& engine, const Bar&
 
 void NativeExecutionConsumer::deliver_confirmed_script(BacktestEngine& engine, const Bar& bar,
                                                        const NativeCoordinate& base) {
-    const bool high_first = internal::bar_path_uses_high_first(bar);
+    // Native AUTO depends on this input, including when another legacy host
+    // has installed a forced path around a nested native run.
+    const bool high_first = std::abs(bar.high - bar.open) < std::abs(bar.open - bar.low);
     auto emit_match = [&](double price, int64_t time, NativePriceProvenance provenance,
                           NativePathPhase phase) {
         NativeDriverPoint point;
diff --git a/tests/CMakeLists.txt b/tests/CMakeLists.txt
index 8799de1..3fd4e04 100644
--- a/tests/CMakeLists.txt
+++ b/tests/CMakeLists.txt
@@ -9,6 +9,7 @@ set(TEST_SOURCES
     test_native_market_vertical
     test_native_market_vertical_contract
     test_native_calendar_driver_contract
+    test_native_auto_path
     test_native_host_repairs
     test_order_action_integration
     test_placement_facts
diff --git a/tests/test_native_auto_path.cpp b/tests/test_native_auto_path.cpp
new file mode 100644
index 0000000..f222bd5
--- /dev/null
+++ b/tests/test_native_auto_path.cpp
@@ -0,0 +1,57 @@
+#include <pineforge/native_host.hpp>
+#include <cstdio>
+#include <vector>
+using namespace pineforge;
+struct Native final : NativeStrategyHost {
+  void on_native_bar(const Bar&, const NativeDecisionContext&) override {}
+};
+NativeRunSpec configuration() {
+  NativeRunSpec s;
+  s.identity={"r2-auto-path-witness",1}; s.input_tf="1"; s.script_tf="1";
+  s.ticker="N";s.tickerid="TEST:N";s.type="crypto";s.currency="USD";
+  s.basecurrency="USD";s.description="native";s.volumetype="base";
+  s.timezone="UTC";s.session="24x7";s.initial_capital=10000;
+  s.point_value=1;s.account_fx=1;s.price_tick=.01;s.fee_value=0;
+  return s;
+}
+// A separate legacy host installs its own forced path in thread-local state.
+// Native AUTO must remain independent while nested inside that callback.
+struct Outer final : BacktestEngine {
+  Native& native;
+  Bar input{100,110,99,100,1,1736121600000LL};
+  explicit Outer(Native& n, const Bar& b):native(n),input(b) {}
+  void on_bar(const Bar&) override { native.run(&input,1); }
+};
+std::vector<int> phases(const Native& n) {
+  std::vector<int> out;
+  for(const auto& e:n.native_events(0)) if(e.driver) {
+    const auto p=e.driver->coordinate.path_phase;
+    if(p==NativePathPhase::High || p==NativePathPhase::Low) out.push_back(int(p));
+  }
+  return out;
+}
+int run_case(int forced, const Bar& b, const std::vector<int>& expected) {
+  Native alone, nested;
+  if(alone.configure_native(configuration()).status!=NativeSetupStatus::Applied ||
+     nested.configure_native(configuration()).status!=NativeSetupStatus::Applied) return 1;
+  alone.run(&b,1);
+  Outer outer(nested,b); outer.set_path_order(forced); outer.run(&b,1);
+  const auto a=phases(alone), n=phases(nested);
+  const bool ok=alone.native_state().kind==NativeLifecycleKind::Completed &&
+      nested.native_state().kind==NativeLifecycleKind::Completed && a==expected && n==a;
+  if(!ok) {
+    std::printf("FAIL forced=%d standalone:",forced);for(int x:a) std::printf(" %d",x);
+    std::printf(" nested:");for(int x:n) std::printf(" %d",x);
+    std::printf(" expected:");for(int x:expected) std::printf(" %d",x);
+    std::printf("\n");
+  }
+  return ok?0:1;
+}
+int main() {
+  constexpr int64_t t=1736121600000LL;
+  int failures=run_case(1,{100,110,99,100,1,t},{3,2});
+  failures+=run_case(2,{100,101,90,100,1,t},{2,3});
+  failures+=run_case(1,{100,110,90,100,1,t},{3,2});
+  std::printf("%s native AUTO isolation: 3 cases, %d failures\n",failures?"FAIL":"PASS",failures);
+  return failures?1:0;
+}