It is version 18.104.22.16854. The vCenters are 5.5 U3 and 6.5 U1.
I noticed the collection log for the 6.5 U1 vCenter says, "Failed to collect Inventory Service Tags data.
The remote server returned an unexpected response: (400) Bad Request."
Maybe it is a VMware bug
I opened support case #02320165.