I have had this issue happen a few times so far. I named the template as “2026 Template” and all of a sudden it’s missing when I re-open Cubase 15. It will sometimes show up, sometimes it wont. I can see it when I open it in my Windows 11 browser(C:\Users\Virgi\AppData\Roaming\Steinberg\Cubase 15_64\Project Templates ), but is hidden in the Cubase opening screen where my templates are listed. I have been building my own PC’s for the past 25 years, so it’s not like I have a lack of memory (64gb). Ghost in the machine?
Could you please post a screenshot of your hub so we can see what you’re seeing.