I wanted to update mutt to the last version from the devel project

    zypper as -f https://download.opensuse.org/repositories/server:/mail/15.4/
server:mail

Since then every zypper command fails with:

  root> zypper se less
  Refreshing service 'server:mail'.
  Problem retrieving the repository index file for service 'server:mail':
  File './repo/repoindex.xml' not found on medium
'https://download.opensuse.org/repositories/server:/mail/15.4/?cookies=0'
  Check if the URI is valid and accessible.
  Segmentation fault (core dumped)

I tried to remove the repository but it failed:

  root> zypper rr server:mail
  Repository 'server:mail' not found by alias, number or URI.

And the repository is not listed:

root@alley:/var/log> zypper lr
Repository priorities are without effect. All enabled repositories share the
same priority.

#  | Alias                       | Name                                        
                                               | Enabled | GPG Check | Refresh
---+-----------------------------+---------------------------------------------------------------------------------------------+---------+-----------+--------
 1 | google-chrome               | google-chrome                               
                                               | Yes     | (r ) Yes  | Yes
 2 | openSUSE-Leap-15.4-1        | openSUSE-Leap-15.4-1                        
                                               | Yes     | (r ) Yes  | Yes
 3 | repo-backports-debug-update | Update repository with updates for openSUSE
Leap debuginfo packages from openSUSE Backports | No      | ----      | ----
 4 | repo-backports-update       | Update repository of openSUSE Backports     
                                               | Yes     | (r ) Yes  | Yes
 5 | repo-debug                  | Debug Repository                            
                                               | No      | ----      | ----
 6 | repo-debug-non-oss          | Debug Repository (Non-OSS)                  
                                               | No      | ----      | ----
 7 | repo-debug-update           | Update Repository (Debug)                   
                                               | No      | ----      | ----
 8 | repo-debug-update-non-oss   | Update Repository (Debug, Non-OSS)          
                                               | No      | ----      | ----
 9 | repo-non-oss                | Non-OSS Repository                          
                                               | Yes     | (r ) Yes  | Yes
10 | repo-oss                    | Main Repository                             
                                               | Yes     | (r ) Yes  | Yes
11 | repo-sle-debug-update       | Update repository with debuginfo for updates
from SUSE Linux Enterprise 15                  | No      | ----      | ----
12 | repo-sle-update             | Update repository with updates from SUSE
Linux Enterprise 15                                | Yes     | (r ) Yes  | Yes
13 | repo-source                 | Source Repository                           
                                               | No      | ----      | ----
14 | repo-update                 | Main Update Repository                      
                                               | Yes     | (r ) Yes  | Yes
15 | repo-update-non-oss         | Update Repository (Non-Oss)                 
                                               | Yes     | (r ) Yes  | Yes


The problem still persists.