mdadm raid4 and raid5 reporting less active devices in dmesg than in mdstat

Issue

• mdadm raid4 and raid5 reporting less active devices in dmesg than in mdstat:

Personalities : [raid6] [raid5] [raid4] 
md0 : active raid4 sdd[4] sdc[2] sdb[1] sda[0]
      1566720 blocks super 1.2 level 4, 512k chunk, algorithm 0 [4/4] [UUUU]

[   35.767435] md/raid:md0: raid level 4 active with 3 out of 4 devices, algorithm 0
....
[   49.688011] md/raid:md0: raid level 5 active with 3 out of 4 devices, algorithm 2