Attaching Source Jars in IntelliJ IDEA does not work

Most appropriate sub-area of Processing 4?

Build process

Processing version

4.3.4

Operating system

Any

Steps to reproduce this

Go to the declaration of any function in core and see the following

snippet

No response

Additional context

Anything to add @edwinRNDR ?

Would you like to work on the issue?

I have not yet been able to find a fix, if someone is interested, otherwise I will pick it up later