diff --git a/crawl4ai/async_configs.py b/crawl4ai/async_configs.py
index e7946f0a6..da3df8769 100644
--- a/crawl4ai/async_configs.py
+++ b/crawl4ai/async_configs.py
@@ -242,8 +242,18 @@ def from_serializable_dict(data: Any) -> Any:
     if isinstance(data, (str, int, float, bool)):
         return data
 
-    # Handle typed data
-    if isinstance(data, dict) and "type" in data:
+    # Handle typed data.
+    # Only enter the typed-object path for dicts that match the shapes produced
+    # by to_serializable_dict(): {"type": "<ClassName>", "params": {...}} or
+    # {"type": "dict", "value": {...}}.  Plain business dicts that happen to
+    # carry a "type" key (e.g. JSON-Schema fragments, JsonCss field specs like
+    # {"type": "text", "name": "..."}) have neither "params" nor "value" and
+    # must fall through to the raw-dict path below so they are passed as data.
+    if (
+        isinstance(data, dict)
+        and "type" in data
+        and ("params" in data or (data["type"] == "dict" and "value" in data))
+    ):
         # Handle plain dictionaries
         if data["type"] == "dict" and "value" in data:
             return {k: from_serializable_dict(v) for k, v in data["value"].items()}