I save a score as Template. The fonts, I saved are all Petaluma.
When I open the template, I choose Petaluma for notation and Text. The the score opens, for a little Moment I see the score with Petaluma. Then the fonts change to another Font.
If you start your template from the Create New page of the Hub, then the settings on the right-hand side, including for Music font and Text font will still be applied, whether you choose a built-in template or one of your own. If you don’t want those settings on the right-hand side to be applied, instead use the File > New From Template menu to choose your project template.
An interesting question regarding this appeared in the German forum: it’s not possible to change the staff spacing when opening a template from the hub. I assume that is because it was already defined in the template. I just wonder why it’s possible to change the music font via the hub, a thing that I personally consider being less likely to be changed when deciding to go for a template, compared to staff size.
It’s an interesting point. Perhaps we ought to disable the Music font and Text font controls when opening a user-defined template as well. I’ll think about it.