diff --git a/nextcloud_mcp_server/server/deck.py b/nextcloud_mcp_server/server/deck.py
index 19942c4a..2638f099 100644
--- a/nextcloud_mcp_server/server/deck.py
+++ b/nextcloud_mcp_server/server/deck.py
@@ -242,7 +242,8 @@ def _append_archived_cards(stack: DeckStack, extra: list[DeckCard]) -> None:
     """Append archived cards onto a stack's existing card list, in place.
 
     Kept separate so the assignment stays correctly typed against
-    ``DeckStack.cards`` (``list[DeckCard | DeckCardSummary] | None``)."""
+    ``DeckStack.cards`` (``list[DeckCard | DeckCardSummary] | None``).
+    """
     merged: list[DeckCard | DeckCardSummary] = list(stack.cards or [])
     merged.extend(extra)
     stack.cards = merged
diff --git a/tests/server/test_deck_mcp.py b/tests/server/test_deck_mcp.py
index 5800cbe5..30a2f337 100644
--- a/tests/server/test_deck_mcp.py
+++ b/tests/server/test_deck_mcp.py
@@ -505,7 +505,9 @@ async def test_deck_get_stack_status_includes_archived_mcp(
         payload = json.loads(result.content[0].text)
         return [c["id"] for c in (payload.get("cards") or [])]
 
-    assert archived_id not in await stack_card_ids("open")
+    open_ids = await stack_card_ids("open")
+    assert card_data["id"] in open_ids, "open card must stay visible under 'open'"
+    assert archived_id not in open_ids
     assert archived_id in await stack_card_ids("all")
     assert await stack_card_ids("archived") == [archived_id]