diff --git a/plugins/platforms/discord/adapter.py b/plugins/platforms/discord/adapter.py
index c619880f81..3439d7c0a7 100644
--- a/plugins/platforms/discord/adapter.py
+++ b/plugins/platforms/discord/adapter.py
@@ -1287,9 +1287,10 @@ class DiscordAdapter(DiscordMediaMixin, BasePlatformAdapter):
                 # ``socket_event_type`` for every parsed DISPATCH frame on every connection and it
                 # is NOT gated behind ``enable_debug_events`` (unlike ``on_socket_raw_receive`` —
                 # verified against discord.py 2.7.1 ``gateway.py``: ``received_message`` calls
-                # ``self._dispatch('socket_event_type', event)`` before the op-code switch).
-                # Heartbeat ACKs return before that dispatch, so an ACKing-but-deaf socket leaves
-                # this stamp frozen while every transport-side check reads healthy.
+                # ``self._dispatch('socket_event_type', event)`` before the op-code switch, gated
+                # on a non-null ``t``). Heartbeat ACK frames carry ``t: null`` and skip that
+                # dispatch, so an ACKing-but-deaf socket leaves this stamp frozen while every
+                # transport-side check reads healthy.
                 adapter_self._last_dispatched_event_monotonic = time.perf_counter()
 
             @self._client.event
diff --git a/tests/gateway/test_discord_event_silence.py b/tests/gateway/test_discord_event_silence.py
index 351d65712a..33616ec533 100644
--- a/tests/gateway/test_discord_event_silence.py
+++ b/tests/gateway/test_discord_event_silence.py
@@ -111,9 +111,17 @@ async def test_zero_silence_bound_disables_only_that_dimension(monkeypatch):
 
     await _connect(adapter, monkeypatch, _dispatching_bot)
     bot = adapter._client
-    _transport_healthy(bot, ack_age=120.0)
     adapter._last_dispatched_event_monotonic = time.perf_counter() - 1000.0
 
+    # Knob at 0: a stale stamp alone must read healthy (the dimension is off),
+    # with every transport-side sample green.
+    _transport_healthy(bot)
+    assert adapter._read_websocket_health(bot) == (True, "healthy")
+
+    # Same stale stamp, now with a stale heartbeat ACK: the transport guards
+    # still trip, and only the ack-age dimension is named.
+    _transport_healthy(bot, ack_age=120.0)
+
     await _wait_until(lambda: handler.await_count, "probe did not run with the knob at 0", timeout=8.0)
     assert adapter._fatal_error_code == "discord_websocket_health_stale"
     assert "ack_stale" in (adapter._fatal_error_message or "")