nopen not respecting disableWarningInGeneratedCode errorprone setting

I am attempting to use nopen with an Android Project, but cannot seem to disable the errors in generated code. nopen is currently flagging the ButterKnife generated view bindings. My app module build.gradle is as follows:

```
apply plugin: 'com.android.application'
apply plugin: "net.ltgt.errorprone"

android {
compileSdkVersion 29
buildToolsVersion "29.0.2"

def keystorePropertiesFile = rootProject.file("keystore.properties")
def keystoreProperties = new Properties()
keystoreProperties.load(new FileInputStream(keystorePropertiesFile))

defaultConfig {
applicationId "com.nickwelna.issuemanagerforgithub"
minSdkVersion 21
targetSdkVersion 29
versionCode 1
versionName "1.0"
testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
buildConfigField "String", "CLIENT_SECRET", keystoreProperties["CLIENT_SECRET"]
}
buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
}
}
compileOptions {
sourceCompatibility JavaVersion.VERSION_1_8
targetCompatibility JavaVersion.VERSION_1_8
}

}

dependencies {
implementation 'androidx.appcompat:appcompat:1.1.0'
implementation 'androidx.legacy:legacy-support-v4:1.0.0'
implementation 'androidx.recyclerview:recyclerview:1.1.0-beta05'
implementation 'androidx.cardview:cardview:1.0.0'
implementation 'androidx.constraintlayout:constraintlayout:2.0.0-beta2'
implementation "androidx.navigation:navigation-fragment:2.2.0-beta01"
implementation "androidx.navigation:navigation-ui:2.2.0-beta01"
implementation 'com.google.android.material:material:1.1.0-beta01'
implementation 'com.google.firebase:firebase-core:17.2.0'
implementation 'com.google.firebase:firebase-auth:19.1.0'
implementation 'com.google.firebase:firebase-database:19.1.0'
implementation 'com.jakewharton:butterknife:10.2.0'
annotationProcessor 'com.jakewharton:butterknife-compiler:10.2.0'
implementation 'com.google.code.gson:gson:2.8.5'
implementation 'com.github.bumptech.glide:glide:4.10.0'
annotationProcessor 'com.github.bumptech.glide:compiler:4.10.0'
implementation 'com.squareup.retrofit2:retrofit:2.6.2'
implementation 'com.squareup.retrofit2:converter-gson:2.6.2'
implementation 'com.squareup.retrofit2:converter-moshi:2.6.2'
debugImplementation 'com.squareup.leakcanary:leakcanary-android:1.6.3'
releaseImplementation 'com.squareup.leakcanary:leakcanary-android-no-op:1.6.3'
debugImplementation 'com.squareup.leakcanary:leakcanary-support-fragment:1.6.3'
implementation 'com.google.flogger:flogger:0.4'
implementation 'com.google.flogger:flogger-system-backend:0.4'
implementation 'com.squareup.moshi:moshi:1.8.0'
implementation 'com.squareup.okhttp3:logging-interceptor:4.2.2'

compileOnly 'com.jakewharton.nopen:nopen-annotations:1.0.1'
errorprone "com.google.errorprone:error_prone_core:2.3.3"
errorprone 'com.jakewharton.nopen:nopen-checker:1.0.1'
errorproneJavac "com.google.errorprone:javac:9+181-r4173-1"
}

android.applicationVariants.all { variant ->
variant.javaCompileProvider.configure {
options.errorprone.disableWarningsInGeneratedCode = true
}
}

apply plugin: 'com.google.gms.google-services'
```
And my project build.gradle:
```
// Top-level build file where you can add configuration options common to all sub-projects/modules.

buildscript {
repositories {
google()
jcenter()
gradlePluginPortal()
}
dependencies {
classpath 'net.ltgt.gradle:gradle-errorprone-plugin:1.1.0'
classpath 'com.android.tools.build:gradle:3.5.1'
classpath 'com.google.gms:google-services:4.3.2'
}
}

allprojects {
repositories {
google()
jcenter()
}
}

task clean(type: Delete) {
delete rootProject.buildDir
}
```
Am I missing something?

Start with the app module build.gradle and project build.gradle, then reproduce the Android build using nopen, Error Prone, and the generated ButterKnife bindings. Trace how options.errorprone.disableWarningsInGeneratedCode is applied to the Java compile task; done means generated-code diagnostics are suppressed without disabling the checker for handwritten code.

Written by the indexing model from the issue text.