[Bug]: First graph in new project is always invisible

### What happened?

First graph is not shown in "Graphs" unless I save the project

### What was the expected functionality?

First graph is immediately shown in "Graphs"

### Describe your environment

MacOS 14.2.1

### Relevant log output

_No response_

### Relevant screenshots


### Code of Conduct

- [X] I agree to follow this project's Code of Conduct

Start by reproducing the issue in a new project on macOS: create the first graph and check the Graphs view before and after saving. Trace the TypeScript code involved in creating and displaying the first graph; done means the first graph appears immediately without requiring the project to be saved.

Written by the indexing model from the issue text.