diff --git a/djangorota/rota/forms.py b/djangorota/rota/forms.py
index 72eb453..129aa92 100644
--- a/djangorota/rota/forms.py
+++ b/djangorota/rota/forms.py
@@ -168,11 +168,40 @@ class WorkerForm(forms.ModelForm):
                 if val is None or val == "":
                     opts[k] = []
                 else:
-                    try:
-                        parsed = json.loads(val)
-                    except Exception:
+                    # If the cleaned value is a JSON string, parse it. If
+                    # it's already a Python structure (possibly containing
+                    # pydantic models from `clean()`), keep it but normalize
+                    # any model instances into serializable dicts.
+                    if isinstance(val, str):
+                        try:
+                            parsed = json.loads(val)
+                        except Exception:
+                            parsed = val
+                    else:
                         parsed = val
-                    opts[k] = parsed
+
+                    def _normalize(obj):
+                        # Normalize pydantic BaseModel instances (v2:v1)
+                        if hasattr(obj, "model_dump"):
+                            try:
+                                return obj.model_dump()
+                            except Exception:
+                                pass
+                        if hasattr(obj, "dict") and not isinstance(obj, dict):
+                            try:
+                                return obj.dict()
+                            except Exception:
+                                pass
+                        # Recurse lists/tuples
+                        if isinstance(obj, list):
+                            return [_normalize(i) for i in obj]
+                        if isinstance(obj, tuple):
+                            return [_normalize(i) for i in obj]
+                        if isinstance(obj, dict):
+                            return {k: _normalize(v) for k, v in obj.items()}
+                        return obj
+
+                    opts[k] = _normalize(parsed)
 
         instance.options = opts
         if commit: