macOS 12.3 MontereyでPython 2.7が削除されたことによるFirebase Unity SDKのAndroidリソース生成のエラー。

firebase sdk 8.7.0でunityを開くと、このエラーが発生します。

ErrorCode
1Unable to find command line tool python required for Firebase Android resource generation.
2python is required to generate the Firebase Android resource file google-services.xml from Assets/Firebase/GoogleService-Info.plist. Without Firebase Android resources, your app will fail to initialize.
3python was distributed with each Firebase Unity SDK plugin, was it deleted?
4
5System.ComponentModel.Win32Exception (0x80004005): ApplicationName='python', CommandLine='"/Users/xxx/Documents/unity-project/Assets/Firebase/Editor/generate_xml_from_google_services_json.py" -i "Assets/Firebase/GoogleService-Info.plist" -l --plist', CurrentDirectory='/Users/xxx/Documents/unity-project', Native error= mono-io-layer-error (2)
6  at System.Diagnostics.Process.StartWithCreateProcess (System.Diagnostics.ProcessStartInfo startInfo) [0x002dc] in <0463b2ef957545c0a51b42f372cd4fbb>:0 
7  at System.Diagnostics.Process.Start () [0x0003a] in <0463b2ef957545c0a51b42f372cd4fbb>:0 
8  at (wrapper remoting-invoke-with-check) System.Diagnostics.Process.Start()
9  at GooglePlayServices.CommandLine.RunViaShell (System.String toolPath, System.String arguments, System.String workingDirectory, System.Collections.Generic.Dictionary`2[TKey,TValue] envVars, GooglePlayServices.CommandLine+IOHandler ioHandler, System.Boolean useShellExecution, System.Boolean stdoutRedirectionInShellMode) [0x002dc] in Z:\tmp\tmp.cvthQg1D2s\third_party\unity\unity_jar_resolver\source\AndroidResolver\src\CommandLine.cs:631 
10  at GooglePlayServices.CommandLine.Run (System.String toolPath, System.String arguments, System.String workingDirectory, System.Collections.Generic.Dictionary`2[TKey,TValue] envVars, GooglePlayServices.CommandLine+IOHandler ioHandler) [0x00000] in Z:\tmp\tmp.cvthQg1D2s\third_party\unity\unity_jar_resolver\source\AndroidResolver\src\CommandLine.cs:510 
11  at Firebase.Editor.PythonExecutor.Run (System.Collections.Generic.IEnumerable`1[T] arguments, System.String workingDirectory, System.Collections.Generic.Dictionary`2[TKey,TValue] envVars, GooglePlayServices.CommandLine+IOHandler ioHandler) [0x00000] in Z:\tmp\tmp.dYyxJerQE9\firebase\app\client\unity\editor\src\PythonExecutor.cs:180 
12  at Firebase.Editor.GenerateXmlFromGoogleServicesJson.RunResourceGenerator (System.Collections.Generic.IEnumerable`1[T] arguments, System.String inputPath, System.Boolean showCommandLine) [0x0001b] in Z:\tmp\tmp.dYyxJerQE9\firebase\app\client\unity\editor\src\GenerateXmlFromGoogleServicesJson.cs:521 
13 #0 GetStacktrace(int)
14 #1 DebugStringToFile(DebugStringToFileData const&)
15 #2 DebugLogHandler_CUSTOM_Internal_Log(LogType, LogOption, ScriptingBackendNativeStringPtrOpaque*, ScriptingBackendNativeObjectPtrOpaque*)
16 #3  (Mono JIT Code) (wrapper managed-to-native) UnityEngine.DebugLogHandler:Internal_Log (UnityEngine.LogType,UnityEngine.LogOption,string,UnityEngine.Object)
17 #4  (Mono JIT Code) [Z:\tmp\tmp.dYyxJerQE9\firebase\app\client\unity\editor\src\GenerateXmlFromGoogleServicesJson.cs:407] Firebase.Editor.GenerateXmlFromGoogleServicesJson:ReadBundleIds (string)

python /Users/xxx/Documents/unity-project/Assets/Firebase/Editor/generate_xml_from_google_services_json.py" -i "Assets/Firebase/GoogleService-Info.plist" -l --plist をシェルで実行したらアプリのバンドル ID com.myapp.bundle が正常に出力されたのです。

firebase sdkの再インポート、unityの再起動、macの再起動も試しましたが、いずれも解決しません。
似たような問題を検索してみましたが、残念ながら解決策は見つかりませんでした。

このエラーが表示される前にやったこと macOSを最新のMonterey 12.3にアップグレードしました。Python2.7が消されたことが原因なのはわかっていますが、どのように修正すればいいかわかっていません。

何か手助けをお願いします。かなり絶望的になってきて、一日中これにかかりっきりになっています。