Default template for new posts should be "Single," not "404"

[zoonini]

When adding a new post, the default template used is the "404 not found" template.

This is unintuitive, confusing, and not just logical.

Steps to Replicate

1. Deactivate all plugins
2. Go to Posts > Add New
3. Look at the Templates settings area and note that the template is "404"

Expected Behaviour

The expected behaviour would be for the default template to be Single, not 404.

In fact, with the Gutenberg plugin active (I tested with both 13.5.2 and 13.6.0), the default template used for posts is Single, as expected, but activating the plugin should not be needed to achieve the correct behaviour.

Reports

See multiple users reports here: ​https://wordpress.org/support/topic/new-post-template-is-404/

[zoonini]

Add New Post

[SergeyBiryukov]

Hi there, thanks for the ticket!

I think this is not specific to the theme and should be resolved in [53594] / #56058 for WordPress 6.0.1.

See #GB40799 for the upstream PR in the Gutenberg repository.

[zoonini]

@SergeyBiryukov Excellent, thank you!

[SergeyBiryukov]

Closing as fixed in [53594] / #56058. The WordPress 6.0.1 release is ​planned for July 12.