I currently use Nextcloud for this thing. It checks all other boxes, but for scrum management Deck is only option and it is super bad. I think OpenProject has some Nextcloud integrations, but I don’t like OpenProjects pricing model so have not tried it.

I really hope there is was betters apps for this.

Looks like weird bug. It has different thumbnail on Mastodon, but it links to this post correctly. Here is link to Mastodon post: https://feddit.nl/post/52370698