Quickly creating an issue for this; proper issue summary will follow.
https://www.drupal.org/docs/8/upgrade/upgrade-using-web-browser#pre-upgr...
If the database credentials to your source database are correct, the upgrade review page will appear as illustrated in the screenshot below. This page shows a summary of the upgrade status for all installed modules on the old site.
Latest iterations use this help text instead:
The new site is missing modules corresponding to the old site's modules. Unless they are installed prior to the upgrade, configuration and/or content needed by them will not be available on your new site. Read the checklist to help decide what to do.

Recent comments
You can edit this View (/admin/structure/views) to suit your needs. The MORE link is used to display additional results, which can sometimes be useful.
Blog module questions
Hello, I have a question about the block “Recent blog posts”. I've set it up so that the five most recent blog posts are always displayed on the page (mybackdrop.de/blog) at the TOP...
Blog module questions
I fixed the usage statistics again today and filed an issue against Project module to fix it permanently: https://github.com/backdrop-contrib/project/issues/66 The short explanation is...
July 16th, 2026 - Weekly Meetings