Comment # 2 on bug 1207804 from Dominique Leuenberger

(In reply to Wilms from comment #1)
> Apparently this was only an issue with GNOME_Factory:
> 
> zypper lr -u
> 
> #  | Alias                                | Name                            
> | Enabled   | GPG Check       | Refresh        | URI
> ---+--------------------------------------+----------------------------------
> --------------+-----------+-----------------+----------------+---------------
> -------------------------------------------------------------------
>  1 | GNOME_Factory                        | Development branch of GNOME
> (openSUSE_Factory) | Yes        | (r ) Yes         | No           |
> https://download.opensuse.org/repositories/GNOME:/Factory/openSUSE_Factory/

Specifically: you have the repo set to Not refresh - which on a dynamic repo
sounds like a bad idea.

Either enable auto-refresh or run zypper refresh