Error activating a block theme with WordPress 6.8-beta2

[rock4temps]

The following themes are installed but incomplete:
Nom:Twenty Twenty-Five
Description: Template is missing. Standalone themes need to have a templates/index.html or index.php template file. Child themes need to have a Template header in the style.css stylesheet.

Consequently, if you activate a Twenty Twenty-Five child theme, the Appearance/Editor menu is no longer available, but instead Appearance/Design

[poena]

Hi @rock4temps and welcome to WordPress trac.

I am not able to reproduce this.
Can you please
1) Test again with the current nightly release of 6.8 Release Candidate.
2) Add the full details of how to reproduce it, including which files are in your child theme, any custom folder structures, multisite settings, the slug you used as the template in the child themes's style.css.

[rock4temps]

Hello,

1) I retested with the current version of the 6.8 Release Candidate, and I no longer have any problems.
2) I have another problem with the Twenty Twenty Five theme, but I'll open another track.