Steps to reproduce: 1. Add contact(s) with module code CS2100 2. `rm m/cs2100x`  Result: - Contact(s) with module code CS2100 are removed although CS2100 and CS2100X are not the same <!--session: 1635494520381-f82c7867-fe60-474c-893b-d45e97e03efe--> <!--Version: Web v3.4.1-->