diff --git a/test/CMakeLists.txt b/test/CMakeLists.txt
index 08866fe4..59dc315c 100644
--- a/test/CMakeLists.txt
+++ b/test/CMakeLists.txt
@@ -95,6 +95,13 @@ if(UNIX AND NOT SUBPROJECT)
       set_target_properties(test_extra_hex_base64_base58 PROPERTIES
         CXX_STANDARD ${MDBX_CXX_STANDARD} CXX_STANDARD_REQUIRED ON)
     endif()
+    add_executable(test_extra_doubtless_positioning extra/doubtless_positioning.c++)
+    target_include_directories(test_extra_doubtless_positioning PRIVATE "${PROJECT_SOURCE_DIR}")
+    target_link_libraries(test_extra_doubtless_positioning ${TOOL_MDBX_LIB})
+    if(MDBX_CXX_STANDARD)
+      set_target_properties(test_extra_doubtless_positioning PROPERTIES
+        CXX_STANDARD ${MDBX_CXX_STANDARD} CXX_STANDARD_REQUIRED ON)
+    endif()
   endif()
 endif()
 
@@ -180,6 +187,7 @@ else()
       add_test(NAME extra_maindb_ordinal COMMAND test_extra_maindb_ordinal)
       add_test(NAME extra_dupfixed_multiple COMMAND test_extra_dupfixed_multiple)
       add_test(NAME extra_hex_base64_base58 COMMAND test_extra_hex_base64_base58)
+      add_test(NAME extra_doubtless_positioning COMMAND test_extra_doubtless_positioning)
     endif()
   endif()
 
diff --git a/test/extra/doubtless_positioning.c++ b/test/extra/doubtless_positioning.c++
new file mode 100644
index 00000000..aff30792
--- /dev/null
+++ b/test/extra/doubtless_positioning.c++
@@ -0,0 +1,263 @@
+#include "mdbx.h++"
+#include <array>
+#include <functional>
+#include <iostream>
+#include <random>
+#include <unistd.h>
+
+static ::std::ostream &operator<<(::std::ostream &out,
+                                  const mdbx::cursor::move_operation op) {
+  static const char *const str[] = {"FIRST",
+                                    "FIRST_DUP",
+                                    "GET_BOTH",
+                                    "GET_BOTH_RANGE",
+                                    "GET_CURRENT",
+                                    "GET_MULTIPLE",
+                                    "LAST",
+                                    "LAST_DUP",
+                                    "NEXT",
+                                    "NEXT_DUP",
+                                    "NEXT_MULTIPLE",
+                                    "NEXT_NODUP",
+                                    "PREV",
+                                    "PREV_DUP",
+                                    "PREV_NODUP",
+                                    "SET",
+                                    "SET_KEY",
+                                    "SET_RANGE",
+                                    "PREV_MULTIPLE",
+                                    "SET_LOWERBOUND",
+                                    "SET_UPPERBOUND",
+                                    "TO_KEY_LESSER_THAN",
+                                    "TO_KEY_LESSER_OR_EQUAL",
+                                    "TO_KEY_EQUAL",
+                                    "TO_KEY_GREATER_OR_EQUAL",
+                                    "TO_KEY_GREATER_THAN",
+                                    "TO_EXACT_KEY_VALUE_LESSER_THAN",
+                                    "TO_EXACT_KEY_VALUE_LESSER_OR_EQUAL",
+                                    "TO_EXACT_KEY_VALUE_EQUAL",
+                                    "TO_EXACT_KEY_VALUE_GREATER_OR_EQUAL",
+                                    "TO_EXACT_KEY_VALUE_GREATER_THAN",
+                                    "TO_PAIR_LESSER_THAN",
+                                    "TO_PAIR_LESSER_OR_EQUAL",
+                                    "TO_PAIR_EQUAL",
+                                    "TO_PAIR_GREATER_OR_EQUAL",
+                                    "TO_PAIR_GREATER_THAN"};
+  return out << str[op];
+}
+
+using buffer = mdbx::default_buffer;
+using buffer_pair = mdbx::buffer_pair<buffer>;
+
+std::default_random_engine prng(42);
+
+static buffer random(const unsigned &value) {
+  switch (prng() % 3) {
+  default:
+    return buffer::hex(value);
+  case 1:
+    return buffer::base64(value);
+  case 2:
+    return buffer::base58(value);
+  }
+}
+
+static buffer random_key() { return random(prng() % 10007); }
+
+static buffer random_value() { return random(prng() % 47); }
+
+using predicate = std::function<bool(const mdbx::pair &, const mdbx::pair &)>;
+
+static bool probe(mdbx::txn txn, mdbx::map_handle dbi,
+                  mdbx::cursor::move_operation op, predicate cmp,
+                  const buffer_pair &pair) {
+  auto seeker = txn.open_cursor(dbi);
+  auto scanner = seeker.clone();
+
+  const bool scan_backward =
+      op == mdbx::cursor::key_lesser_than ||
+      op == mdbx::cursor::key_lesser_or_equal ||
+      op == mdbx::cursor::multi_exactkey_value_lesser_than ||
+      op == mdbx::cursor::multi_exactkey_value_lesser_or_equal ||
+      op == mdbx::cursor::pair_lesser_than ||
+      op == mdbx::cursor::pair_lesser_or_equal;
+
+  const bool is_multi = mdbx::is_multi(txn.get_handle_info(dbi).value_mode());
+
+  auto seek_result = seeker.move(op, pair.key, pair.value, false);
+  auto scan_result = scanner.fullscan(
+      [cmp, &pair](const mdbx::pair &scan) -> bool { return cmp(scan, pair); },
+      scan_backward);
+  if (seek_result.done == scan_result &&
+      (!scan_result ||
+       seeker.is_same_position(
+           scanner,
+           op < mdbx::cursor::multi_exactkey_value_lesser_than && is_multi)))
+    return true;
+
+  std::cerr << std::endl;
+  std::cerr << "bug:";
+  std::cerr << std::endl;
+  std::cerr << std::string(is_multi ? "multi" : "single") << "-map, op " << op
+            << ", key " << pair.key << ", value " << pair.value;
+  std::cerr << std::endl;
+  std::cerr << "\tscanner: ";
+  if (scan_result)
+    std::cerr << "     done, key " << scanner.current(false).key << ", value "
+              << scanner.current(false).value;
+  else
+    std::cerr << "not-found";
+  std::cerr << std::endl;
+  std::cerr << "\t seeker: " << (seek_result.done ? "     done" : "not-found")
+            << ", key " << seek_result.key << ", value " << seek_result.value;
+  std::cerr << std::endl;
+  return false;
+}
+
+static bool probe(mdbx::txn txn, mdbx::map_handle dbi,
+                  mdbx::cursor::move_operation op, predicate cmp) {
+  const auto pair = buffer_pair(random_key(), random_value());
+  const bool ok = probe(txn, dbi, op, cmp, pair);
+#if MDBX_DEBUG
+  if (!ok)
+    // повтор для отладки и поиска причин
+    probe(txn, dbi, op, cmp, pair);
+#endif /* MDBX_DEBUG */
+  return ok;
+}
+
+static bool test(mdbx::txn txn, mdbx::map_handle dbi) {
+  bool ok = true;
+
+  ok = probe(txn, dbi, mdbx::cursor::key_lesser_than,
+             [txn, dbi](const mdbx::pair &l, const mdbx::pair &r) -> bool {
+               return mdbx_cmp(txn, dbi, l.key, r.key) < 0;
+             }) &&
+       ok;
+  ok = probe(txn, dbi, mdbx::cursor::key_lesser_or_equal,
+             [txn, dbi](const mdbx::pair &l, const mdbx::pair &r) -> bool {
+               return mdbx_cmp(txn, dbi, l.key, r.key) <= 0;
+             }) &&
+       ok;
+  ok = probe(txn, dbi, mdbx::cursor::key_equal,
+             [txn, dbi](const mdbx::pair &l, const mdbx::pair &r) -> bool {
+               return mdbx_cmp(txn, dbi, l.key, r.key) == 0;
+             }) &&
+       ok;
+  ok = probe(txn, dbi, mdbx::cursor::key_greater_or_equal,
+             [txn, dbi](const mdbx::pair &l, const mdbx::pair &r) -> bool {
+               return mdbx_cmp(txn, dbi, l.key, r.key) >= 0;
+             }) &&
+       ok;
+  ok = probe(txn, dbi, mdbx::cursor::key_greater_than,
+             [txn, dbi](const mdbx::pair &l, const mdbx::pair &r) -> bool {
+               return mdbx_cmp(txn, dbi, l.key, r.key) > 0;
+             }) &&
+       ok;
+
+  ok = probe(txn, dbi, mdbx::cursor::multi_exactkey_value_lesser_than,
+             [txn, dbi](const mdbx::pair &l, const mdbx::pair &r) -> bool {
+               return mdbx_cmp(txn, dbi, l.key, r.key) == 0 &&
+                      mdbx_dcmp(txn, dbi, l.value, r.value) < 0;
+             }) &&
+       ok;
+  ok = probe(txn, dbi, mdbx::cursor::multi_exactkey_value_lesser_or_equal,
+             [txn, dbi](const mdbx::pair &l, const mdbx::pair &r) -> bool {
+               return mdbx_cmp(txn, dbi, l.key, r.key) == 0 &&
+                      mdbx_dcmp(txn, dbi, l.value, r.value) <= 0;
+             }) &&
+       ok;
+  ok = probe(txn, dbi, mdbx::cursor::multi_exactkey_value_equal,
+             [txn, dbi](const mdbx::pair &l, const mdbx::pair &r) -> bool {
+               return mdbx_cmp(txn, dbi, l.key, r.key) == 0 &&
+                      mdbx_dcmp(txn, dbi, l.value, r.value) == 0;
+             }) &&
+       ok;
+  ok = probe(txn, dbi, mdbx::cursor::multi_exactkey_value_greater_or_equal,
+             [txn, dbi](const mdbx::pair &l, const mdbx::pair &r) -> bool {
+               return mdbx_cmp(txn, dbi, l.key, r.key) == 0 &&
+                      mdbx_dcmp(txn, dbi, l.value, r.value) >= 0;
+             }) &&
+       ok;
+  ok = probe(txn, dbi, mdbx::cursor::multi_exactkey_value_greater,
+             [txn, dbi](const mdbx::pair &l, const mdbx::pair &r) -> bool {
+               return mdbx_cmp(txn, dbi, l.key, r.key) == 0 &&
+                      mdbx_dcmp(txn, dbi, l.value, r.value) > 0;
+             }) &&
+       ok;
+
+  ok = probe(txn, dbi, mdbx::cursor::pair_lesser_than,
+             [txn, dbi](const mdbx::pair &l, const mdbx::pair &r) -> bool {
+               auto cmp = mdbx_cmp(txn, dbi, l.key, r.key);
+               if (cmp == 0)
+                 cmp = mdbx_dcmp(txn, dbi, l.value, r.value);
+               return cmp < 0;
+             }) &&
+       ok;
+  ok = probe(txn, dbi, mdbx::cursor::pair_lesser_or_equal,
+             [txn, dbi](const mdbx::pair &l, const mdbx::pair &r) -> bool {
+               auto cmp = mdbx_cmp(txn, dbi, l.key, r.key);
+               if (cmp == 0)
+                 cmp = mdbx_dcmp(txn, dbi, l.value, r.value);
+               return cmp <= 0;
+             }) &&
+       ok;
+  ok = probe(txn, dbi, mdbx::cursor::pair_equal,
+             [](const mdbx::pair &l, const mdbx::pair &r) -> bool {
+               return l == r;
+             }) &&
+       ok;
+  ok = probe(txn, dbi, mdbx::cursor::pair_greater_or_equal,
+             [txn, dbi](const mdbx::pair &l, const mdbx::pair &r) -> bool {
+               auto cmp = mdbx_cmp(txn, dbi, l.key, r.key);
+               if (cmp == 0)
+                 cmp = mdbx_dcmp(txn, dbi, l.value, r.value);
+               return cmp >= 0;
+             }) &&
+       ok;
+  ok = probe(txn, dbi, mdbx::cursor::pair_greater_than,
+             [txn, dbi](const mdbx::pair &l, const mdbx::pair &r) -> bool {
+               auto cmp = mdbx_cmp(txn, dbi, l.key, r.key);
+               if (cmp == 0)
+                 cmp = mdbx_dcmp(txn, dbi, l.value, r.value);
+               return cmp > 0;
+             }) &&
+       ok;
+  return ok;
+}
+
+int main(int argc, const char *argv[]) {
+  (void)argc;
+  (void)argv;
+
+  unlink("." MDBX_DATANAME);
+  unlink("." MDBX_LOCKNAME);
+  mdbx::env_managed env(".", mdbx::env_managed::create_parameters(),
+                        mdbx::env::operate_parameters(3));
+
+  auto txn = env.start_write();
+  auto single =
+      txn.create_map("single", mdbx::key_mode::usual, mdbx::value_mode::single);
+  auto multi =
+      txn.create_map("multi", mdbx::key_mode::usual, mdbx::value_mode::multi);
+  for (size_t i = 0; i < 1000; ++i) {
+    auto key = random_key();
+    txn.upsert(single, key, random_value());
+    for (auto n = prng() % 5 + 1; n > 0; --n)
+      txn.upsert(multi, key, random_value());
+  }
+  txn.commit_embark_read();
+
+  bool ok = true;
+  for (size_t i = 0; ok && i < 3333; ++i) {
+    ok = test(txn, single) && ok;
+    ok = test(txn, multi) && ok;
+  }
+
+  if (!ok) {
+    std::cerr << "Fail\n";
+    return EXIT_FAILURE;
+  }
+  std::cout << "OK\n";
+  return EXIT_SUCCESS;
+}