Partner visa 309- sponsorship application?

Hi all I submitted my application for my 309 visa close to 6 months ago. When I submitted my application I filled out the "Stage 1- Partner or prospective marriage visa online application" but we didn't fill out the "Sponsorship for a Partner to migrate to Australia" application. Once I started attaching documents to my application I saw in the attachments section there was 100 attachments allowed under my name and 100 documents allowed under my sponsor. Because his name was showing up under my application and attachments under his name I figured there was no need to fill out a separate "Sponsorship for a Partner to migrate to Australia" application. We also filled out the 40sp form in paper, scanned, and uploaded it under his name already, all of this under MY application.

Did I make a stupid mistake by not filling out the sponsorship application as well? I looked on the homeaffairs website partner visa 309 and nowhere does it say the sponsor has to fill out a separate online application or maybe I missed this information somehow? I have had no contact from any CO since submitting and we frontloaded with medicals and police checks as well. Thanks for any advice I'm a bit worried that I should have done this step as well but I didnt find it as a requirement on the website even though both application options are available when submitting online.