Help making a source/test jest config work

[toddscan]

I'm using the .projectionist.json config from this gist:

https://gist.github.com/mthadley/e5389f45b4fb951be067fe42357d679d

but altered slightly for my naming conventions:

{
	"**/__tests__/*.spec.tsx": {
		"alternate": "{}.tsx",
		"type": "test"
	},
	"*.tsx": {
		"alternate": "{dirname}/__tests__/{basename}.spec.tsx",
		"type": "source"
	}
}

The source matcher works as expected, but reversing that from the test matcher does this:

E345: Cannot find file "/Users/<user>/<project>/<repo>/app/javascript/src/features/<feature>/<subdir>/__tests__/__tests__/<component>.spec.spec.tsx" 

I've tried changing test to use basename, dirname, file, and variations on ../{}.tsx all to no avail. How do I make this work?