This sounds like a bug. You should not have to disconnect/reconnect the NIC/network.
What version of VVD/vSphere are you running?
In a VVD there will always be 2 PSCs, highly-available.
Perhaps it is a bug. I do not remember what version of VVD. But I may go back and move our vCenter and hypervisors to Standard Switches. Though that is some work. And also that leaves me with 2 unused uplinks no our VDS. Which always drives me crazy, and no way to delete them.
I assume VVD has changed anyway, since PSCs are being deprecated.
VVD uses distributed switches, no standard vSwitches. You can have 4 NICs in the distributed switch.
I suggest you file a support request, as this behavior is unexpected.
VVD still uses external PSCs, for now. It will change.