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Your example works perfectly fine.
I copy &amp; pasted it, added a `println` in `doMyStuff` and applied the plugin.
And everything works as expected.
Can you provide a full MCVE where it does not work?

Thanks for doing that Vampire, much appreciated.  I'll keep digging and see if I can create an MVCE for it if I can't figure it out.

<@URQ797WRW> Do you know if Gradle does an caching within the plugin such as vars or companion objects, gradle project object, etc.?

I'm not sure I understand what you mean.
companion objects are in JVM terms static members, so are usually not a good idea, at least not to hold state, if that was the question.