JsonSchemaCompletionContributor and PsiReferenceContributor

Hi.

I realized PsiReferenceContributor for JSON language. Also I realized getVariants method in PsiReferenceProvider for code completion and it's work great (Go To declaration, code completion).
But if I choose JSON schema for file, code completion did not work and getVariants never call.
I think this is because getVariants called from the LegacyCompletionContributor which called after the JsonSchemaCompletionContributor. JsonSchemaCompletionContributor stopping the execution chain if JSON file has JSON schema.

public static void doCompletion(@NotNull final CompletionParameters parameters,
                                @NotNull final CompletionResultSet result,
                                @NotNull final JsonSchemaObject rootSchema) {
  doCompletion(parameters, result, rootSchema, true);
}

public static void doCompletion(@NotNull final CompletionParameters parameters,
                                @NotNull final CompletionResultSet result,
                                @NotNull final JsonSchemaObject rootSchema,
                                boolean stop) {
  final PsiElement completionPosition = parameters.getOriginalPosition() != null ? parameters.getOriginalPosition() :
                                        parameters.getPosition();
  new Worker(rootSchema, parameters.getPosition(), completionPosition, result).work();
  if (stop) {
    result.stopHere();
  }
}

Is it a bug or is there a way to perform getVariants with JSON schema?