diff --git a/tiramisu/config.py b/tiramisu/config.py
index 95f5711..383bd8b 100644
--- a/tiramisu/config.py
+++ b/tiramisu/config.py
@@ -809,9 +809,16 @@ class KernelGroupConfig(_CommonConfig):
             resetted_opts = []
         if isinstance(self, KernelMixConfig):
             super().cfgimpl_reset_cache(option_bag,
-                                  resetted_opts=copy(resetted_opts))
+                                        resetted_opts=copy(resetted_opts))
         for child in self._impl_children:
-            child.cfgimpl_reset_cache(option_bag,
+            if option_bag is not None:
+                coption_bag = option_bag.copy()
+                cconfig_bag = coption_bag.config_bag.copy()
+                cconfig_bag.context = child
+                coption_bag.config_bag = cconfig_bag
+            else:
+                coption_bag = None
+            child.cfgimpl_reset_cache(coption_bag,
                                       resetted_opts=copy(resetted_opts))
 
     def set_value(self,