Anaconda installer does not disable kdump.service even with kdump marked as disabled

Issue

• kdump.service is enabled even though it's disabled during Anaconda instalation process, while crashkernel=auto kernel parameter will be added or removed depending on that.
• kdump.service always fails to start due to missing crashkernel=auto parameter.

$ systemctl status kdump.service --no-pager -l
● kdump.service - Crash recovery kernel arming
   Loaded: loaded (/usr/lib/systemd/system/kdump.service; enabled; vendor preset: enabled)
   Active: failed (Result: exit-code) since Mon 2020-02-10 18:48:03 JST; 2min 32s ago
  Process: 977 ExecStart=/usr/bin/kdumpctl start (code=exited, status=1/FAILURE)
 Main PID: 977 (code=exited, status=1/FAILURE)

Feb 10 18:48:03 localhost.localdomain systemd[1]: Starting Crash recovery kernel arming...
Feb 10 18:48:03 localhost.localdomain kdumpctl[977]: No memory reserved for crash kernel
Feb 10 18:48:03 localhost.localdomain kdumpctl[977]: Starting kdump: [FAILED]
Feb 10 18:48:03 localhost.localdomain systemd[1]: kdump.service: Main process exited, code=exited, status=1/FAILURE
Feb 10 18:48:03 localhost.localdomain systemd[1]: kdump.service: Failed with result 'exit-code'.
Feb 10 18:48:03 localhost.localdomain systemd[1]: Failed to start Crash recovery kernel arming.

$ cat /proc/cmdline
BOOT_IMAGE=(hd0,msdos1)/vmlinuz-4.18.0-80.el8.x86_64 root=/dev/mapper/rhel-root ro resume=/dev/mapper/rhel-swap rd.lvm.lv=rhel/root rd.lvm.lv=rhel/swap rhgb quiet