I just type on a TW install. systemd-coredump is not installed.
The install is from beginning of November. I chose minimum installation and than chose my KDE Plasma packages in the custom package selection during installation.
Two Leap 15.2 machines, one end of Nov, installed the same way as above and one recent install from last week, chose Plasma Desktop scheme at installation,
also did not install the package.
Just for info in case that is considered a bug