If a substantive examination is required before the invention patent enters the public stage (and the substantive examination fee is paid), it should wait until the invention patent enters the public stage and start the substantive examination procedure at the same time.
There are three conditions for the supplement to enter the public stage: first, it will enter automatically after the application date 18 months. Two, after the preliminary examination of the invention patent, the applicant put forward a "request for early disclosure", and after the request is qualified, it will enter the public stage. Three, the applicant put forward a request for disclosure in advance before the preliminary examination, and the invention patent will enter the public stage after the preliminary examination.