Sergey Gabrielyan

I think I’ve found the solution. By registering Custom Templates in theme.json, the Swap Template option has been added to the Template Options section.

Screenshot – Custom template files

Page Screenshot Without Custom Templates in theme.json.

Page Screenshots With Custom Templates in theme.json. Screen 1, Screen 2, Screen 3

Custom Templates code

{
  "version": 3,
  "customTemplates": [
    {
      "name": "archive-campus",
      "postTypes": [
        "page"
      ],
      "title": "Archive Campus"
    },
    {
      "name": "archive-event",
      "postTypes": [
        "page"
      ],
      "title": "Archive Event"
    },
    {
      "name": "archive-program",
      "postTypes": [
        "page"
      ],
      "title": "Archive Program"
    },
    {
      "name": "emptycanvas",
      "postTypes": [
        "page"
      ],
      "title": "Empty Canvas"
    },
    {
      "name": "page-my-notes",
      "postTypes": [
        "page"
      ],
      "title": "Page My Notes"
    },
    {
      "name": "page-past-events",
      "postTypes": [
        "page"
      ],
      "title": "Page Past Events"
    },
    {
      "name": "page-search",
      "postTypes": [
        "page"
      ],
      "title": "Page Search"
    },
    {
      "name": "single-campus",
      "postTypes": [
        "page"
      ],
      "title": "Single Campus"
    },
    {
      "name": "single-event",
      "postTypes": [
        "page"
      ],
      "title": "Single Event"
    },
    {
      "name": "single-professor",
      "postTypes": [
        "page"
      ],
      "title": "Single Professor"
    },
    {
      "name": "single-program",
      "postTypes": [
        "page"
      ],
      "title": "Single Program"
    }
  ]
}

@justincodes. Thank you, quick edit works. But is there a solution now without a quick edit?

I was wrong about the solution, I should enable Inner blocks use content width

Screenshot 1

Screenshot 2

In addition. After activating the theme, and adding content to Site Editor, the theme with the relationship will be added to the database without any problem.

I’ve found the solution. Maybe there was a problem with my project’s database. I’ve just removed fictional-block-theme row from wp_terms table, and the problem has been solved.

Thanks also to you @threadi , you helped me figure it out too

Screenshot

@threadi. Maybe the problem is in my project. I’ve moved that theme to the newly created project, and in that project, there is no problem.

I’ve done some steps in current project (not newly) to identify the problem, but it hasn’t helped

• Checked current version of project. It’s 6.5.2
• Deactivated all plugins again
• Added define( 'WP_DEBUG', true ); in wp-config.php file to see errors, and then I fixed those errors

Then, I’ve removed index.html file from templates folder, and problem has been solved.

Screenshots

With index.html

Without index.html

But I need the index.html file?

Strangely, that problem is only with that one theme, and only in my current project

I deactivated the plugin initially, but when the problem persisted, I reactivated it again.

I’ve uploaded the theme on GitHub. Link

Hello @threadi. No, I don’t have a child theme. I’ve deactivated all plugins, but the problem hasn’t been solved. There are 5 themes in my project, but only one theme has this problem. I’ve disabled CSS also, but it hasn’t helped also.

This is the behavior. Video

I’ve tried many things, but I can’t understand what is the problem

I’ve posted the question on Github. This is the solution

https://github.com/WordPress/gutenberg/issues/60777