I have done further testing on an instance running the Jenkins master branch and plugins reasonably up to date. I have not managed to find drag & drop errors on job config, but I did find them on Global Tool Configuration.
My findings testing the Git configuration (see video):
- Testing on the Git tools hetero-list component, drag & drop only fails when there's an repeatable element that contains form entries.
- It works fine when only draggable with minimum markup are present on the hetero-list (only have header, help area and remove button). Removing the form fields seems to fix the issue.
- I think the result is the same for the JDK tool configuration.
Hope the explanation is understandable, I can try to rephrase everything. Video dowloadable on
https://drive.google.com/file/d/1DFkH_-XQe6J47ngYkAH730Foe8ausmY9/view?usp=sharing . It was too big to upload to the issue tracker.