Many people that already did the 3V0-622 (VCAP6-DCD) exam received an e-mail from VMware Certification, saying that this exam is under an health check.
There is an google group talking about that here:
VCAP6-DCV Design - Community - Google+
So, the VCAP6-DCD exam is accurate now?
I guess so,
last email received from VMware indicates that Health Check has completed and some beta taker might get different result after 20th November, 2016.
There have been technical issues so the exams will not be remarked until the end of next week. (after 1st December)
Check your results after this time.
The exam might not be modified but the way the marking engine works might be adjusted. There hasn't been any confirmation of either just yet.