diff --git a/esphome/components/esp32/__init__.py b/esphome/components/esp32/__init__.py
index 8ad84656ed..52e70501dc 100644
--- a/esphome/components/esp32/__init__.py
+++ b/esphome/components/esp32/__init__.py
@@ -14,6 +14,7 @@ from esphome.const import (
     CONF_BOARD,
     CONF_COMPONENTS,
     CONF_DISABLED,
+    CONF_ENABLE_FULL_PRINTF,
     CONF_ENABLE_OTA_ROLLBACK,
     CONF_ESPHOME,
     CONF_FRAMEWORK,
@@ -954,7 +955,6 @@ CONF_HEAP_IN_IRAM = "heap_in_iram"
 CONF_LOOP_TASK_STACK_SIZE = "loop_task_stack_size"
 CONF_USE_FULL_CERTIFICATE_BUNDLE = "use_full_certificate_bundle"
 CONF_DISABLE_DEBUG_STUBS = "disable_debug_stubs"
-CONF_ENABLE_FULL_PRINTF = "enable_full_printf"
 CONF_DISABLE_OCD_AWARE = "disable_ocd_aware"
 CONF_DISABLE_USB_SERIAL_JTAG_SECONDARY = "disable_usb_serial_jtag_secondary"
 CONF_DISABLE_DEV_NULL_VFS = "disable_dev_null_vfs"
diff --git a/esphome/const.py b/esphome/const.py
index 88e3c33fbc..d409514f3c 100644
--- a/esphome/const.py
+++ b/esphome/const.py
@@ -356,6 +356,7 @@ CONF_EFFECT = "effect"
 CONF_EFFECTS = "effects"
 CONF_ELSE = "else"
 CONF_ENABLE_BTM = "enable_btm"
+CONF_ENABLE_FULL_PRINTF = "enable_full_printf"
 CONF_ENABLE_IPV6 = "enable_ipv6"
 CONF_ENABLE_ON_BOOT = "enable_on_boot"
 CONF_ENABLE_OTA_ROLLBACK = "enable_ota_rollback"
diff --git a/tests/integration/fixtures/uart_mock_ld2450.yaml b/tests/integration/fixtures/uart_mock_ld2450.yaml
index 7354ebf158..269136da68 100644
--- a/tests/integration/fixtures/uart_mock_ld2450.yaml
+++ b/tests/integration/fixtures/uart_mock_ld2450.yaml
@@ -93,12 +93,17 @@ uart_mock:
     - delay: 100ms
       inject_rx: [0xAA, 0xFF, 0x03, 0x00, 0x01, 0x02, 0x03, 0x04]
 
-    # Phase 4 (t=600ms): Overflow - inject 50 bytes of 0xFF (MAX_LINE_LENGTH=45)
+    # Phase 4 (t=600ms): Overflow - inject 75 bytes of 0xFF (MAX_LINE_LENGTH=45)
     # Buffer has 15 bytes from phases 2+3.
-    # Overflow math: need 29 bytes to fill positions 15-43 (buffer_pos_=44),
-    # then byte 30 at position 44 = MAX_LINE_LENGTH-1 triggers overflow.
-    # After overflow, buffer_pos_ = 0. Remaining 0xFF bytes accumulate
-    # until another overflow or until valid data arrives.
+    # readline_() stores bytes while buffer_pos_ < 44. When buffer_pos_ == 44,
+    # the next byte triggers overflow: logs warning, resets buffer_pos_ to 0,
+    # and discards that byte.
+    #
+    # First overflow: 29 bytes fill positions 15-43 (buffer_pos_=44), byte 30
+    #   triggers overflow (discarded). Total consumed: 30 bytes.
+    # Second overflow: 44 bytes fill positions 0-43 (buffer_pos_=44), byte 45
+    #   triggers overflow (discarded). Total consumed: 30+45 = 75 bytes.
+    # After both overflows, buffer_pos_ = 0 (clean state for recovery frame).
     - delay: 200ms
       inject_rx:
         [
@@ -107,6 +112,9 @@ uart_mock:
           0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
           0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
           0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
+          0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
+          0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
+          0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
         ]
 
     # Phase 5 (t=700ms): Valid frame after overflow - recovery test
diff --git a/tests/integration/test_uart_mock_ld2450.py b/tests/integration/test_uart_mock_ld2450.py
index 9129854505..b1aa2f6952 100644
--- a/tests/integration/test_uart_mock_ld2450.py
+++ b/tests/integration/test_uart_mock_ld2450.py
@@ -189,26 +189,16 @@ async def test_uart_mock_ld2450(
         # Recovery frame values (Phase 5, after overflow):
         # Target 1: X=300, Y=400, Distance=500, Speed=30 (moving away)
         # target_count=1, moving=1, still=0
-        recovery_idx = next(
-            i
-            for i, v in enumerate(collector.sensor_states["target_1_distance"])
-            if v == pytest.approx(500.0, abs=1.0)
+        #
+        # Note: throttle filters cause sensor lists to have different lengths,
+        # so we check each value appeared somewhere rather than using a shared index.
+        assert (
+            pytest.approx(500.0, abs=1.0)
+            in collector.sensor_states["target_1_distance"]
         )
-        assert collector.sensor_states["target_1_x"][recovery_idx] == pytest.approx(
-            300.0
-        )
-        assert collector.sensor_states["target_1_y"][recovery_idx] == pytest.approx(
-            400.0
-        )
-        assert collector.sensor_states["target_1_speed"][recovery_idx] == pytest.approx(
-            30.0
-        )
-        assert collector.sensor_states["target_count"][recovery_idx] == pytest.approx(
-            1.0
-        )
-        assert collector.sensor_states["moving_target_count"][
-            recovery_idx
-        ] == pytest.approx(1.0)
-        assert collector.sensor_states["still_target_count"][
-            recovery_idx
-        ] == pytest.approx(0.0)
+        assert pytest.approx(300.0) in collector.sensor_states["target_1_x"]
+        assert pytest.approx(400.0) in collector.sensor_states["target_1_y"]
+        assert pytest.approx(30.0) in collector.sensor_states["target_1_speed"]
+        assert pytest.approx(1.0) in collector.sensor_states["target_count"]
+        assert pytest.approx(1.0) in collector.sensor_states["moving_target_count"]
+        assert pytest.approx(0.0) in collector.sensor_states["still_target_count"]