Embedded user manual docs missing static assets after upgrade to Nextcloud 32+

⚠️ This issue respects the following points: ⚠️

• This is a bug, not a question or a configuration/webserver/proxy issue.
• This issue is not already reported on Github OR Nextcloud Community Forum (I've searched it).
• Nextcloud Server is up to date. See Maintenance and Release Schedule for supported versions.
• I agree to follow Nextcloud's Code of Conduct.

Bug description

When I go to https://my.nextcloud.domain/core/doc/user/index.html then I get pure html without styles. I looked at the files on the server and noticed that there are no _static and _images folders in core/doc/user folder.

This has been going on since version 32.0.X

Steps to reproduce

1. Go to https://my.nextcloud.domain/core/doc/user/index.html
2. See pure html without styles

Expected behavior

1. Go to https://my.nextcloud.domain/core/doc/user/index.html
2. See html with styles like https://my.nextcloud.domain/core/doc/admin/index.html

Nextcloud Server version

35 (master)

Operating system

No response

PHP engine version

No response

Web server

No response

Database engine version

No response

Is this bug present after an update or on a fresh install?

Upgraded to a MAJOR version (ex. 31 to 32)

Are you using the Nextcloud Server Encryption module?

None

What user-backends are you using?

• Default user-backend (database)
• LDAP/ Active Directory
• SSO - SAML
• Other

Configuration report

List of activated Apps

Nextcloud Signing status

Nextcloud Logs

Additional info

No response

Start at the /core/doc/user/index.html entry point and compare it with /core/doc/admin/index.html, checking how the user manual's _static and _images assets are packaged after an upgrade. Done means the user manual loads with its styles and images on Nextcloud 32 and later.