Description

When opening a Page for editing in the Site Editor, the inserter tab for Patterns is empty, and while blocks are shown clicking them doesn't seem to do anything.

The reason is that the user is required to click into the Page Content block first to be able to insert blocks. This isn't very clear though, I think instead the editor should default to a better insertion point (maybe at the end of Page Content) rather than no insertion point at all.

Step-by-step reproduction instructions

1. Open the Site Editor
2. Go to pages on the left side
3. Select a page for editing
4. Once in the editor, open the main inserter sidebar
5. Try inserting blocks or patterns, find that you can't

Screenshots, screen recording, code snippet

Environment info

Mac OS / Brave
Tested using latest trunk

Please confirm that you have searched existing issues in the repo.

• Yes

Please confirm that you have tested with all plugins deactivated except Gutenberg.

• Yes