Strange.

Did you check what is in $global:defaultVIServers?
Could there be a 2nd connection?

You could always open an SR.
It helps when you use the Get-ErrorReport to capture a log of the error and include that in your SR.

Contrary to what GSS might claim, you do not need a Developer Support contract to open a PowerCLI SR.
Point them to  Online Documentation - PowerCLI 12.3.0 User’s Guide - VMware {code}