To reproduce the problem I’m having.
Start a project
Go to PLAY->playback template->Silence->Apply = as expected there is no more VTS
Add 2 or more VSTi (no matter how many, or if they are different)
Save an Endpoint Configuration for each VSTi
Go to PLAY->playback template->Add Template->Add Manual (add all the endpoints created before)
OK and Apply.
What I have now, is anything but the first VSTi.
One more thing: whenever I add the first VST to the Slot, it already gets number two.