This would make sense if 2.0.3 was released long enough ago for people to start using and relying on a bug, but it was released less than 2 months ago...
The bug in 2.0.3 just breaks one default use case and where you pass in no source or target to the api so anyone using this feature their app broke on upgrade to 2.0.3 and they had to set a source explicitly or revert the version. 2.0.4 just fixes this with no downside unless you like seeing console errors