No custom infection game type?

The reason I am posting this is because I’ve already made a variation of every gametype that emulates halo infinite (search the file browser and you’ll see) and I’d like to follow up by making some to emulate halo 4. However I’ve hit a wall. I can’t create any variation of “infection” or “flood.” I see that this has been an issue for several years and it still hasn’t been explained. Can anyone offer some guidance?

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I wish I could help you, but I haven’t played halo 5 for a while.