Multiple authorship is lost when collaborative draft is published

1. When a collaborative draft is published it only maintains the first authors, the rest are lost. 2. I expect all co-authors of the draft to appear in the author-list of the draft, it otherwise makes no sense to write it collaboratively. 3. I found this bug here at meta.decidim. you can see it here: COLLABORATIVE DRAFT: https://meta.decidim.org/processes/decidim-gov/f/961/collaborative_drafts/2 PUBLISHED PROPOSAL: https://meta.decidim.org/processes/decidim-gov/f/961/proposals/13435