I created this project fresh with version 4.20. When I double click a custom node in a blueprint it opens my personal source code files just fine, but when I double click a native node the editor attempts to look for the source code in a path that doesn’t even exist on my computer:
I have both the source and debug symbols downloaded. I use VS2017 and have the engine updated to 4.20.3. This feature has worked in older versions (if I remember correctly, it stopped working in 4.19) and currently works in another project with a custom 4.20 engine.