I am not 100% sure this is a bug.
I repeated the install on the same hardware & the results are the same - multipath
devices that will not go away.
Both installs were done on a SuperMicro X10SDV-8C-TLN4F
I then did another install on a SuperMicro X10DRi-T, this install has no problem & it
doesn't need a blacklist.
Here is some fpaste info for both installs.
Let me know if you want me to gather some more data.