【Unity】Internal build system error. Backend exited with code 2.

概要

Internal build system error. Backend exited with code 2.
tundra: error: Unexpected stdin

Error building Player because scripts had compiler errors

Build error: Build failed with 3 error(s)
UnityEngine.Debug:LogErrorFormat (string,object[])
Google.Android.AppBundle.Editor.Internal.BuildTools.BuildToolLogger:DisplayErrorDialog (string) (at Library/PackageCache/com.google.android.appbundle@2cc4a10a13f1/Editor/Scripts/Internal/BuildTools/BuildToolLogger.cs:95)
Google.Android.AppBundle.Editor.Internal.BuildTools.AndroidBuilder:Build (UnityEditor.BuildPlayerOptions) (at Library/PackageCache/com.google.android.appbundle@2cc4a10a13f1/Editor/Scripts/Internal/BuildTools/AndroidBuilder.cs:205)
Google.Android.AppBundle.Editor.Internal.BuildTools.AppBundleBuilder:BuildAndroidPlayer (UnityEditor.BuildPlayerOptions) (at Library/PackageCache/com.google.android.appbundle@2cc4a10a13f1/Editor/Scripts/Internal/BuildTools/AppBundleBuilder.cs:179)
Google.Android.AppBundle.Editor.Internal.AppBundlePublisher:Build (Google.Android.AppBundle.Editor.Internal.BuildTools.AppBundleBuilder,Google.Android.AppBundle.Editor.Internal.AppBundlePublisher/AppBundleBuildSettings) (at Library/PackageCache/com.google.android.appbundle@2cc4a10a13f1/Editor/Scripts/Internal/AppBundlePublisher.cs:175)
Google.Android.AppBundle.Editor.Internal.AppBundlePublisher:Build (UnityEditor.BuildPlayerOptions,Google.Android.AppBundle.Editor.AssetPackConfig,bool) (at Library/PackageCache/com.google.android.appbundle@2cc4a10a13f1/Editor/Scripts/Internal/AppBundlePublisher.cs:111)
Google.Android.AppBundle.Editor.Bundletool:BuildBundle (UnityEditor.BuildPlayerOptions,Google.Android.AppBundle.Editor.AssetPackConfig,bool) (at Library/PackageCache/com.google.android.appbundle@2cc4a10a13f1/Editor/Scripts/Bundletool.cs:80)

Play Asset Delivery を使用して Android ビルドしたら
上記のエラーが発生する現象に遭遇した

Unity を再起動したら発生しなくなった