BUGs in EToys station regarding source files

Steps to reproduce:

1. Prepare your Etoys image as described here
2. Download MorphLayoutArticle.pr and drag it into your image
3. Debug the first warning that is documented here:
   
   

The debugger expands and the context is selected in which the warning has been raised.

Actual behavior:

The invariant contextSourcePcIndex between: 0 and: context method getSource size is violated.

I also discovered that something with the sources file is wrong in the etoys image. I had never to work with this deprecated mechanism and wonder why it is still used in Etoys.

Just to clarify: The following screenshot has been recorded in a #19282 image after activating etoys station:

(Dialog window appeared when pressing the versions button)

However, a regular Trunk image has the following definition:

Is this desired behavior?

I could fix the current bug in context-dependent styling by limiting contextSourcePcIndex to context method getSource size. But I rather think we have a problem with the sources file here?

Any help or explanations are appreciated!

Best,

Christoph