I'm using the following workaround: * Download an older version of the dracut RPM (http://download.opensuse.org/history/20210929/tumbleweed/repo/oss/x86_64/dracut-055+suse.117.ge5fc2048-1.2.x86_64.rpm). * Extract that RPM (mkdir t && cd t && cpio -id ../dracut-055+suse.117.ge5fc2048-1.2.x86_64.rpm). * Copy the extracted installkernel script to /usr/sbin.