[BUG] Changes to project are forgotten if you load another project and then return back to the original project

[NicDoesCode]

Project content was erased when switching from one project to another.

Reproduce:

1. Create a new project, make significant changes to it such as defining palettes and drawing graphics.
2. Create a new project, make some changes to it.
3. Switch back to the first project.

When you switch back, content was gone, it was as if it was a blank project.

Throughout working with the project I did manually download the project as a JSON file a couple of times. On restoring these files the the project content came back.

Maybe saving the project to local storage isn't being triggered?