fix: ensure lazy platform chat ids before load selection

adapter/matrix/bot.py

@@ -153,13 +153,16 @@ class MatrixBot:
             return
         sender = getattr(event, "sender", None)
         body = (getattr(event, "body", None) or "").strip()
+        room_meta = await get_room_meta(self.runtime.store, room.room_id)
+        if room_meta is not None and not room_meta.get("redirect_room_id"):
+            await self._ensure_platform_chat_id(room.room_id, room_meta)
+
         load_pending = await get_load_pending(self.runtime.store, sender, room.room_id)
         if load_pending is not None and (body.isdigit() or body == "!cancel"):
             outgoing = await self._handle_load_selection(sender, room.room_id, body, load_pending)
             await self._send_all(room.room_id, outgoing)
             return
 
-        room_meta = await get_room_meta(self.runtime.store, room.room_id)
         if room_meta is None:
             outgoing = await self._bootstrap_unregistered_room(room, sender)
             if outgoing:
@@ -187,9 +190,6 @@ class MatrixBot:
                 user=sender,
             )
             return
-        else:
-            await self._ensure_platform_chat_id(room.room_id, room_meta)
-
         chat_id = await resolve_chat_id(self.runtime.store, room.room_id, sender)
         incoming = from_room_event(event, room_id=room.room_id, chat_id=chat_id)
         if incoming is None:

tests/adapter/matrix/test_dispatcher.py

@@ -9,7 +9,14 @@ from nio.responses import SyncResponse
 
 from adapter.matrix.bot import MatrixBot, build_runtime, prepare_live_sync
 from adapter.matrix.handlers.auth import handle_invite
-from adapter.matrix.store import get_platform_chat_id, get_room_meta, get_user_meta, set_room_meta, set_user_meta
+from adapter.matrix.store import (
+    get_platform_chat_id,
+    get_room_meta,
+    get_user_meta,
+    set_load_pending,
+    set_room_meta,
+    set_user_meta,
+)
 from core.protocol import IncomingCallback, IncomingCommand, OutgoingMessage
 from sdk.interface import PlatformError
 from sdk.mock import MockPlatformClient
@@ -270,6 +277,37 @@ async def test_bot_leaves_existing_platform_chat_id_unchanged():
     runtime.dispatcher.dispatch.assert_awaited_once()
 
 
+async def test_bot_assigns_platform_chat_id_before_load_selection():
+    runtime = build_runtime(platform=MockPlatformClient())
+    await set_room_meta(
+        runtime.store,
+        "!chat1:example.org",
+        {"chat_id": "C1", "matrix_user_id": "@alice:example.org"},
+    )
+    client = SimpleNamespace(
+        user_id="@bot:example.org",
+        room_send=AsyncMock(),
+    )
+    bot = MatrixBot(client, runtime)
+    await set_load_pending(
+        runtime.store,
+        "@alice:example.org",
+        "!chat1:example.org",
+        {"saves": [{"name": "session-a", "created_at": "2026-04-17T00:00:00+00:00"}]},
+    )
+    room = SimpleNamespace(room_id="!chat1:example.org")
+    event = SimpleNamespace(sender="@alice:example.org", body="0")
+
+    await bot.on_room_message(room, event)
+
+    assert await get_platform_chat_id(runtime.store, "!chat1:example.org") == "matrix:!chat1:example.org"
+    client.room_send.assert_awaited_once_with(
+        "!chat1:example.org",
+        "m.room.message",
+        {"msgtype": "m.text", "body": "Отменено."},
+    )
+
+
 async def test_unregistered_room_bootstraps_space_and_chat_on_first_message():
     runtime = build_runtime(platform=MockPlatformClient())
     await set_user_meta(runtime.store, "@alice:example.org", {"next_chat_index": 1})