Fix bug leading to crashes in CSG due to bug in OAHashMap, closes #20403

core/oa_hash_map.h

@@ -320,7 +320,7 @@ public:
 
 		memdelete_arr(keys);
 		memdelete_arr(values);
-		memdelete(hashes);
+		memdelete_arr(hashes);
 	}
 };