Describe the bug

When using the SchemaTransformer.transformSchema(...) to inject custom API documentation the transformation fails to inject a deprecated reason if it already exist. Injecting deprecated reason on none deprecated fields work as expected. Injecting description on type and field also works as expected.

This bug also apply to input and interface types, as well as object types.

We would like to use this in OpenTripPlanner to customize deployments.

To Reproduce
This test below illustrate the problem. Everything works as expected for field a, but the reason is not updated for field b.

Original Schema

type QueryType {
  a: String
  b: String @deprecated(reason : "Replace this doc")
}

Expected result

type QueryType {
  a: String @deprecated(reason : "NEW REASON")
  b: String @deprecated(reason : "NEW REASON")
}

Actual result

type QueryType {
  a: String @deprecated(reason : "NEW REASON")
  b: String @deprecated(reason : "Replace this doc")
}

JUnit Test

https://gist.github.com/t2gran/69b149357477870ba25e00375a2626a2