mdadm --stop does not remove md devices

Issue

• mdadm --stop /dev/md0 does not remove md device

[root@localhost ~]# cat /proc/mdstat 
Personalities : [raid1] 
md0 : active raid1 sdd1[0] sdd2[1]
      499648 blocks super 1.2 [2/2] [UU]

unused devices: <none>

[root@localhost ~]# mdadm --stop /dev/md0
mdadm: stopped /dev/md0

[root@localhost ~]# cat /proc/mdstat 
Personalities : [raid1] 
unused devices: <none>

[root@localhost ~]# ls /dev/md*
/dev/md0

/dev/md:
md-device-map

[root@localhost ~]# ls /sys/block/md*
alignment_offset  bdi  capability  dev  discard_alignment  ext_range  holders  inflight  md  power  queue  range  removable  ro  size  slaves  stat  subsystem  trace  uevent

[root@localhost ~]# ls -d /sys/block/md*
/sys/block/md0

• Issue does not exist in Red Hat Enterprise Linux 7.3