I'm running AE CC 19 (16.0.0) and DUIK 16.0.8.
I believe I found a bug related to the Spring automation.
It bugs whenever I try to use it on any Rotation or Y Position/X Position animation. It does work with the Bounce function turned on though.
The following dialog appears:

It also seems to be working on Scale and Position (without separating dimensions) without a problem.
It was working fine before the CC 19 update.
Am I missing something?
Thanks!