include = X.Y
Even though the included properties are there in the response, the properties of resource Y is undefined if they are not cached with an additional direct GET to the Y resource
On debugging found this code
https://github1s.com/orbitjs/ember-orbit/blob/HEAD/addon/-private/store.ts#L335-L336
Any chance for the cache lookup handling to cause this issue ? Or is this a deliberately added flow ?