Just yesterday I had a case with template crashing Cubase 8.5. I made a template from existing project in C8.5, and loaded it back into the same C8.5. Then after loading template I tried to delete a track with HSSE, and Cubase crashed. It was simply impossible to delete that track without crash.
After several attempts, and crash each time, I loaded template in previuous version, C8.0. It opened fine, I deleted track without any problem, saved project, and reopened it in C8.5 without any problem. Now template works fine in C8.5 too.
This means that something is wrong with C8.5, that was ok in C8.0.
So, my advice, try opening and re-saving your template in older Cubase version (C8.0 or C7.5), and see if you can get arround bugs in C8.5 like this.