I don't quite understand what you said. If the invention and new model applied for at the same time really have the same "before the claim 1-5", in the substantive examination stage of the invention patent, if the examiner wants to authorize your invention, it will definitely put forward the examination opinions, asking you to modify the claim of the invention patent to make it different from the utility model applied for on the same day, or give up the utility model patent right that has been obtained earlier. If you don't give up the utility model patent right and modify the invention patent right, you shouldn't authorize your invention, so you don't know what the "invention and new model have been authorized" is.
If this happens, that is, both patents are authorized, you should ensure that both patents exist at the same time. Personally, I think you can also make a request for invalidation of the invention patent right, declare the invention claim 1-5 invalid, and then delete the invention patent claim 1-5 in the invalidation procedure. In this way, the two patents can basically exist stably.
How to avoid the problem of repeated authorization of inventions and new types, I think it should be the examiner's problem, not the applicant's?
As an applicant, I think it is a good choice to apply for the invention and new technical scheme on the same day, and if the protection scope is the same, it can save the annual fee! If the applicant doesn't want to save money, that is, he wants to obtain two certificates as much as possible, then the scope of protection required by the two applications must be different, or the patent claim should be modified in the examination stage of the invention patent to make it different from the new type claim, so as to obtain two certificates. Of course, the coverage of these two certificates is definitely different.