use even better logic for finding state wrt computedvar

reflex/ivars/base.py

@@ -21,6 +21,7 @@ from typing import (
     List,
     Literal,
     Optional,
+    Sequence,
     Set,
     Tuple,
     Type,
@@ -1485,22 +1486,38 @@ class ImmutableComputedVar(ImmutableVar[RETURN_TYPE]):
         Returns:
             The value of the var for the given instance.
         """
-        from reflex.state import BaseState
-
         if instance is None:
-            list_of_modules = self.fget.__qualname__.split(".")
+            from reflex.state import BaseState
+
+            path_to_function = self.fget.__qualname__.split(".")
             class_name_where_defined = (
-                list_of_modules[-2] if len(list_of_modules) > 1 else owner.__name__
+                path_to_function[-2] if len(path_to_function) > 1 else owner.__name__
             )
-            classes_where_defined = [
-                c
-                for c in inspect.getmro(owner)
-                if c.__name__ == class_name_where_defined
-            ]
+
+            def contains_class_name(states: Sequence[Type]) -> bool:
+                return any(c.__name__ == class_name_where_defined for c in states)
+
+            def is_not_mixin(state: Type[BaseState]) -> bool:
+                return not state._mixin
+
+            def length_of_state(state: Type[BaseState]) -> int:
+                return len(inspect.getmro(state))
+
             class_where_defined = cast(
                 Type[BaseState],
-                classes_where_defined[0] if classes_where_defined else owner,
+                min(
+                    filter(
+                        is_not_mixin,
+                        filter(
+                            lambda state: contains_class_name(inspect.getmro(state)),
+                            inspect.getmro(owner),
+                        ),
+                    ),
+                    default=owner,
+                    key=length_of_state,
+                ),
             )
+
             return self._replace(
                 _var_name=format_state_name(class_where_defined.get_full_name())
                 + "."