Yes!  I also have some Teradici clients with the same behavior.  Our firmware is very outdated so I'm bummed to hear that your newer versions are still having issues.  Although it's not ideal, our workaround was to downgrade the Horizon agents to 8.2 (b2103) and using the video drivers with that and NOT installing the SVGA driver that was delivered with the latest vsphere 7 updates.

In my case, we only have a single monitor attached to these systems so it didn't matter if it was primary or secondary but definitely related to the vertical/90-degree rotation.