Snippets and Pages should be placed inside the Implementation module if they are to be used freely. See the academy material: https://academy.mendix.com/link/modules/533
Or my notes (from that Academy material) if you will https://stephanbruijnis.dev/docs/notes/mendix-academy/adaptable-solutions-learning-paths/#hidden-documents
So basically you can't access the snippets from a solution unless its in the implementation module
Try to grasp the issue, but I can't.
What is the source of "created a new project, based on our solution"
> guess you created a new project based on a project package/starter app
What is your definition of invisible;
> cannot discovered in the app explorer?
> cannot be found using CTRL-g?
> can be found in app explorer, but not when placing a snippet widget on a page and searching for the snippet to connect?
Snippets and pages part of a module in a project package, should be visible
If the snippets are part of a marketplace module, CTRL-g doesn't include marketplace modules by default
The filter setting can be changed in the search window