Yes, that is what it could have done. As long as they are different , you need not bother.
In fact most who did it did not report any further problems necessitating any further change in the unique id.
This problem will arise again only when you have say two other identical drives with the same unique id and you bring one online as you did. That will reset one to 00000000 and then you will have two drives with the unique id 00000000. So again one of the two with the same unique id 00000000 will not show.
But now you know what to do. Check and change the unique id. It can be any 8 digit hexadecimal. The only thing is that it has to be different so that a signature clash does not occur.
It is with this in mind and also to help others who encounter the same problem, I put out the addiional reference as to how to check and change the unique id.
(If you are still worried change 00000000 to 33B27DF4.