diff --git a/deps/rabbitmq_mqtt/src/mc_mqtt.erl b/deps/rabbitmq_mqtt/src/mc_mqtt.erl
index b6cae214c8c3..27f4e9cf81e1 100644
--- a/deps/rabbitmq_mqtt/src/mc_mqtt.erl
+++ b/deps/rabbitmq_mqtt/src/mc_mqtt.erl
@@ -426,7 +426,7 @@ protocol_state(Msg = #mqtt_msg{props = Props0,
                 undefined ->
                     Props2;
                 Ttl ->
-                    case maps:get(?ANN_TIMESTAMP, Anns) of
+                    case maps:get(?ANN_TIMESTAMP, Anns, undefined) of
                         undefined ->
                             Props2;
                         Timestamp ->
diff --git a/deps/rabbitmq_mqtt/test/mc_mqtt_SUITE.erl b/deps/rabbitmq_mqtt/test/mc_mqtt_SUITE.erl
index 14d88f357602..c6fd2018f47f 100644
--- a/deps/rabbitmq_mqtt/test/mc_mqtt_SUITE.erl
+++ b/deps/rabbitmq_mqtt/test/mc_mqtt_SUITE.erl
@@ -33,7 +33,8 @@ groups() ->
        mqtt_amqp,
        mqtt_amqp_alt,
        amqp_mqtt,
-       is_persistent
+       is_persistent,
+       amqpl_to_mqtt_gh_12707
       ]}
     ].
 
@@ -156,6 +157,34 @@ roundtrip_amqpl(_Config) ->
     ExpectedUserProperty = lists:keysort(1, UserProperty),
     ?assertMatch(#{'User-Property' := ExpectedUserProperty}, Props).
 
+amqpl_to_mqtt_gh_12707(_Config) ->
+    Props = #'P_basic'{content_type = <<"text/plain">>,
+                        content_encoding = <<"gzip">>,
+                        headers = [],
+                        delivery_mode = 1,
+                        priority = 7,
+                        correlation_id = <<"gh_12707-corr">> ,
+                        reply_to = <<"reply-to">>,
+                        expiration = <<"12707">>,
+                        message_id = <<"msg-id">>,
+                        timestamp = 99,
+                        type = <<"45">>,
+                        user_id = <<"gh_12707">>,
+                        app_id = <<"rmq">>
+                        },
+    Payload = [<<"gh_12707">>],
+    Content = #content{properties = Props,
+                        payload_fragments_rev = Payload},
+    Content = #content{properties = Props,
+                        payload_fragments_rev = Payload},
+    Anns = #{
+        ?ANN_EXCHANGE => <<"amq.topic">>,
+        ?ANN_ROUTING_KEYS => [<<"dummy">>]
+    },
+    OriginalMsg = mc:init(mc_amqpl, Content, Anns),
+    Converted = mc:convert(mc_mqtt, OriginalMsg),
+    ?assertEqual(12707, mc:get_annotation(ttl, Converted)).
+
 %% Non-UTF-8 Correlation Data should also be converted (via AMQP 0.9.1 header x-correlation-id).
 roundtrip_amqpl_correlation(_Config) ->
     Msg0 = mqtt_msg(),
diff --git a/deps/rabbitmq_mqtt/test/protocol_interop_SUITE.erl b/deps/rabbitmq_mqtt/test/protocol_interop_SUITE.erl
index 249e335e2afd..28bdfa0d0513 100644
--- a/deps/rabbitmq_mqtt/test/protocol_interop_SUITE.erl
+++ b/deps/rabbitmq_mqtt/test/protocol_interop_SUITE.erl
@@ -35,6 +35,7 @@ groups() ->
     [{cluster_size_1, [shuffle],
       [
        mqtt_amqpl_mqtt,
+       amqpl_mqtt_gh_12707,
        mqtt_amqp_mqtt,
        amqp_mqtt_amqp,
        mqtt_stomp_mqtt,
@@ -169,6 +170,39 @@ mqtt_amqpl_mqtt(Config) ->
 
     ok = emqtt:disconnect(C).
 
+amqpl_mqtt_gh_12707(Config) ->
+    Q = ClientId = atom_to_binary(?FUNCTION_NAME),
+    Ch = rabbit_ct_client_helpers:open_channel(Config),
+    #'queue.declare_ok'{} = amqp_channel:call(Ch, #'queue.declare'{queue = Q, durable = true}),
+    #'queue.bind_ok'{} = amqp_channel:call(Ch, #'queue.bind'{queue = Q,
+                                                                exchange = <<"amq.topic">>,
+                                                                routing_key = <<"gh12707">>}),
+    C = connect(ClientId, Config),
+
+    Topic = <<"gh12707">>,
+    Payload = <<"gh_12707">>,
+
+    {ok, _, [1]} = emqtt:subscribe(C, #{'Subscription-Identifier' => 676}, [{Topic, [{qos, 1}]}]),
+    amqp_channel:call(Ch, #'basic.publish'{exchange = <<"amq.topic">>,
+                                            routing_key = Topic},
+                        #amqp_msg{payload = Payload,
+                                    props = #'P_basic'{content_type  = <<"application/json">>,
+                                                        expiration    = <<"12707">>,
+                                                        headers       = []}}),
+
+    receive {publish,
+                #{topic := MqttTopic,
+                    payload := MqttPayload}} ->
+        ?assertEqual(MqttTopic, Topic),
+        ?assertEqual(Payload, MqttPayload)
+    after 1000 ->
+        ct:fail("did not receive a delivery")
+    end,
+
+    amqp_channel:call(Ch, #'queue.delete'{queue = Q}),
+    rabbit_ct_client_helpers:close_channel(Ch),
+    ok = emqtt:disconnect(C).
+
 mqtt_amqp_mqtt(Config) ->
     Host = ?config(rmq_hostname, Config),
     Port = rabbit_ct_broker_helpers:get_node_config(Config, 0, tcp_port_amqp),