Comment # 1 on bug 1189881 from Martin Wilck

This warning is emitted because there is no file
/boot/symvers-5.13.12-2-default.gz, but a KMP is installed, and without the
symvers weak-module2 can't check reliably for unresolved symbols. This file has
indeed been moved to /usr/lib/modules/5.13.12-2-default/symvers.gz. However,
the kernel-default package claims to contain a symlink

>  /boot/symvers-5.13.12-2-default.gz -> ../usr/lib/modules/5.13.12-2-default/symvers.gz

This symlink is missing after installation. It seems that it's just packaged as
a ghost file, but the link is never created. The %post scripts actually only
create links for vmlinuz, sysctl.conf, and System.map.

Anyway I need to support this in weak-modules2. 

Please try again with s-m-t from OBS
home:mwilck:suse-module-tools/suse-module-tools.