This is apparent when attempting to use a component that uses refs, multiple React instances appear to be introduced, at least during development. Unclear if it is actually being caused by development tools or not.

tscherler first reported this as:
You can not use any dependency that uses @refs since of duplicate Reacts.

https://gist.github.com/scherler/2e3b0f6a8ea6116846d5e5e7420bc3a5

This branch shows an example of the problem: https://github.com/kzantow/blueocean-plugin/tree/victory-failure