Overview diagram is not displayed on new project

[darielrll]

I need to create a C4 diagram models using a personal plantuml server. In this GitHub repository I am trying to get it to work.
I create a docker container for the plantuml server(this is a requirement for my use case), I modified the container to serve also as static files the C4 plantuml core files.

Once the site is generated, the only image that is with error is the first image(context.svg), the one in the Overview section.

I am using by default C4 model example when the project is created initially, my only modification here is to have a local plantuml server and consume core C4 files locally as static files.

This is the preview of the generated file context.svg:

But, if I delete the selected code in the generated file context.svg:

then the image is shown correctly:

So, I need to understand why this is happening, thanks in advance for your help