[Bug]: Files app shows unintended rounded left corners in the content pane after Nextcloud 33 upgrade

⚠️ 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

Hi! I have upgraded from 32.0.11 to 33.0.5 and found that the main page of the Files app contains the left upper and bottom rounded corners. Why? That was not in 32.0.11.

Steps to reproduce

1. Open Files app
2. Observe left upper and bottom rounded corners

Expected behavior

The corners should be flat without rounded style.

Nextcloud Server version

33

Operating system

Debian/Ubuntu

PHP engine version

PHP 8.3

Web server

Apache (supported)

Database engine version

None

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