On a bright side there is an update about eclipse. You need to edit launch and remove excessive mod mentions. It is mentioned in this commit:
Build: 1.13.2-25.0.57 - Tue Feb 26 02:11:50 GMT 2019
john816_:
Update MDK Readme to describe new FG3 procedures. (#5553)
As for eclipse - there is issue currently with eclipse not able to launch your mod using launch configuration. Use gradlew runClient instead. In 1.12 eclipse is fine to both build and run. Hope same will be for 1.13.2