Please file a detailed issue about that in the bug tracker at GitHub - nextcloud/server: āļø Nextcloud server, a safe home for all your data.
As you can see at Test our new work-in-progress upgrader script there has been work on-going since June to improve the updater situation. And this release is the first one to include the new updater improvements. Stuff doesnāt magically fix itself but needs work and testing.