diff --git a/test/CMakeLists.txt b/test/CMakeLists.txt
index 3296f5a5..697f27fd 100644
--- a/test/CMakeLists.txt
+++ b/test/CMakeLists.txt
@@ -284,6 +284,7 @@ else()
       add_extra_test(doubtless_positioning TIMEOUT 10800)
       add_extra_test(crunched_delete TIMEOUT 10800)
       add_extra_test(dbi)
+      add_extra_test(open)
     endif()
   endif()
 
diff --git a/test/extra/open.c++ b/test/extra/open.c++
new file mode 100644
index 00000000..d475182c
--- /dev/null
+++ b/test/extra/open.c++
@@ -0,0 +1,88 @@
+#include "mdbx.h++"
+
+#include <iostream>
+
+#if !defined(__cpp_lib_latch) && __cpp_lib_latch < 201907L
+
+int main(int argc, const char *argv[]) {
+  (void)argc;
+  (void)argv;
+  std::cout << "FAKE-OK (since no C++20 std::thread and/or std::latch\n";
+  return EXIT_SUCCESS;
+}
+
+#else
+
+#include <latch>
+#include <thread>
+
+static char log_buffer[1024];
+
+static void logger_nofmt(MDBX_log_level_t loglevel, const char *function,
+                         int line, const char *msg, unsigned length) noexcept {
+  (void)length;
+  (void)loglevel;
+  fprintf(stdout, "%s:%u %s", function, line, msg);
+}
+
+int main(int argc, const char *argv[]) {
+  (void)argc;
+  (void)argv;
+
+  mdbx_setup_debug_nofmt(MDBX_LOG_VERBOSE, MDBX_DBG_ASSERT, logger_nofmt,
+                         log_buffer, sizeof(log_buffer));
+
+  mdbx::path path = "test-open";
+  mdbx::env::remove(path);
+
+  {
+    mdbx::env::operate_parameters operateParameters2(100, 10);
+    mdbx::env_managed::create_parameters createParameters2;
+    createParameters2.geometry.make_fixed(42 * mdbx::env::geometry::MiB);
+    mdbx::env_managed env2(path, createParameters2, operateParameters2);
+    mdbx::txn_managed txn2 = env2.start_write(false);
+    /* mdbx::map_handle testHandle2 = */ txn2.create_map(
+        "fap1", mdbx::key_mode::reverse, mdbx::value_mode::single);
+    txn2.commit();
+  }
+
+  mdbx::env::operate_parameters operateParameters(100, 10);
+  mdbx::env_managed::create_parameters createParameters;
+  createParameters.geometry.make_dynamic(21 * mdbx::env::geometry::MiB,
+                                         84 * mdbx::env::geometry::MiB);
+  mdbx::env_managed env(path, createParameters, operateParameters);
+  mdbx::txn_managed txn = env.start_write(false);
+  /* mdbx::map_handle testHandle = */ txn.create_map(
+      "fap1", mdbx::key_mode::usual, mdbx::value_mode::single);
+  txn.commit();
+
+  std::latch starter(1);
+
+  std::thread t1([&]() {
+    starter.wait();
+    // mdbx::env_managed env(path, createParameters, operateParameters);
+    mdbx::txn_managed txn = env.start_write(false);
+    /* mdbx::map_handle testHandle = */ txn.create_map(
+        "fap1", mdbx::key_mode::usual, mdbx::value_mode::single);
+    txn.commit();
+  });
+
+  std::thread t2([&]() {
+    starter.wait();
+    // mdbx::env_managed env(path, createParameters, operateParameters);
+    mdbx::txn_managed txn = env.start_write(false);
+    /* mdbx::map_handle testHandle = */ txn.create_map(
+        "fap1", mdbx::key_mode::usual, mdbx::value_mode::single);
+    txn.commit();
+  });
+
+  starter.count_down();
+
+  t1.join();
+  t2.join();
+
+  std::cout << "OK\n";
+  return EXIT_SUCCESS;
+}
+
+#endif /* __cpp_lib_latch */