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My oldest install of Leap 15.3 currently has 6 kernels.

I ran "zypper purge-kernels" and it did not want to do anything.

Checking, I see that "zypp.conf" was set to keep
"oldest,latest,latest-1,running".

So I removed "oldest" from that list, and tried again.  This time "zypper
purge-kernels" wanted to remove only the oldest.  That would leave 5, when it
should remove all but two.

Checking, I see that for all but the oldest kernel, both "kernel-default-extra"
and "kernel-default-optional" are installed.  I'm wondering whether that is
confusing "libzypp".

Reproducible: Always