When I downgrade yast2-theme, YaST adds yast2-theme-breeze and
yast2-theme-oxygen to resolve dependencies. Then if I run "zypper lu -t package
-t patch" it says patch openSUSE-SLE-15.3-2021-3573 is recommended, but with no
packages. "zypper patch --with-update" indeeds wants to repeat the operation
seen in attachment #853405 [details] i.e. remove yast2-theme-oxygen and
yast2-theme-breeze in order to upgrade yast2-theme. This time I answered not to
install the patch but I expect that in the future every run of "zypper patch
--with-update" will have the same problem until the incompatibility is fixed.