A modern programming language that makes developers happier.

kotlinlang

In my KMM project I changed the namespace defined in the Android module's build file.  Noticing that was a daft thing to do (having changed nothing else), I've changed it back, but now every reference to "R" fails.

I've cleared caches, I've rebuilt the project, nada!
I've recreated the import line, and then rebuilt the lines with R in them.  This offers me exactly the existing path but selection of the prompted value still gives an error.

How do I fix this?

This, again, appears to just be the test, since the project builds and runs perfectly well.

Any ideas on how to fix it?
(Incidentally I notice I haven't mentioned this is Flamingo Patch 1)