Easy to reproduce.
1. Start a brand new BLANK project (no busses)
2. Load up any softsynth
3. Dial in a patch
4. Save Simple Instrument Track as a Track Template
5. Start a new project from a template with busses (or existing project with busses)
6. Insert the track template
7. Track template output is set to a random bus (for me it was set to my "ElectricGuitar" bus, which is like the 7th down in my project).