diff --git a/Common/src/main/java/at/petrak/hexcasting/common/casting/PatternRegistryManifest.java b/Common/src/main/java/at/petrak/hexcasting/common/casting/PatternRegistryManifest.java
index c15ad6488..66199bfba 100644
--- a/Common/src/main/java/at/petrak/hexcasting/common/casting/PatternRegistryManifest.java
+++ b/Common/src/main/java/at/petrak/hexcasting/common/casting/PatternRegistryManifest.java
@@ -48,7 +48,10 @@ public static void processRegistry(@Nullable ServerLevel overworld) {
                 continue;
 
             if (!HexUtils.isOfTag(registry, key, HexTags.Actions.PER_WORLD_PATTERN)) {
-                NORMAL_ACTION_LOOKUP.put(entry.prototype().getAngles(), key);
+                var old = NORMAL_ACTION_LOOKUP.put(entry.prototype().getAngles(), key);
+                if (old != null) {
+                    HexAPI.LOGGER.warn("Inserted %s which has same signature as %s, overriding it.".formatted(key, old));
+                }
             } else {
                 perWorldActionCount++;
             }