Bug `AmbiguousMatchException` in `GooglePlayServices` when targeting android as of 2021.2

Hey there, it looks like I'm getting the following error a lot as of 2021.2, when setting the build target to Android:

Code (CSharp):

1. AmbiguousMatchException: Ambiguous match found.
2. System.RuntimeType.GetMethodImplCommon (System.String name, System.Int32 genericParameterCount, System.Reflection.BindingFlags bindingAttr, System.Reflection.Binder binder, System.Reflection.CallingConventions callConv, System.Type[] types, System.Reflection.ParameterModifier[] modifiers) (at <202f8c081a504aa2940103428e3fd66b>:0)
3. System.RuntimeType.GetMethodImpl (System.String name, System.Reflection.BindingFlags bindingAttr, System.Reflection.Binder binder, System.Reflection.CallingConventions callConv, System.Type[] types, System.Reflection.ParameterModifier[] modifiers) (at <202f8c081a504aa2940103428e3fd66b>:0)
4. System.Type.GetMethod (System.String name, System.Reflection.BindingFlags bindingAttr) (at <202f8c081a504aa2940103428e3fd66b>:0)
5. System.Type.GetMethod (System.String name) (at <202f8c081a504aa2940103428e3fd66b>:0)
6. GooglePlayServices.UnityCompat.GetUnity56AndAboveApplicationIdentifier (UnityEditor.BuildTarget buildTarget) (at <6161ea2c3dc848909cf65dd754b884ec>:0)
7. GooglePlayServices.UnityCompat.GetApplicationId (UnityEditor.BuildTarget buildTarget) (at <6161ea2c3dc848909cf65dd754b884ec>:0)
8. GooglePlayServices.PlayServicesResolver.GetAndroidApplicationId () (at <6161ea2c3dc848909cf65dd754b884ec>:0)
9. GooglePlayServices.PlayServicesResolver.<PollBundleId>m__36 () (at <6161ea2c3dc848909cf65dd754b884ec>:0)
10. GooglePlayServices.PlayServicesResolver+PropertyPoller`1[T].Poll (System.Func`1[TResult] getCurrentValue, GooglePlayServices.PlayServicesResolver+PropertyPoller`1+Changed[T] changed) (at <6161ea2c3dc848909cf65dd754b884ec>:0)
11. GooglePlayServices.PlayServicesResolver.PollBundleId () (at <6161ea2c3dc848909cf65dd754b884ec>:0)
12. UnityEditor.EditorApplication.Internal_CallUpdateFunctions () (at /Users/bokken/buildslave/unity/build/Editor/Mono/EditorApplication.cs:356)
13.  

Is this my problem or a problem with 2021.2 ? I haven't seen this issue before and have not changed anything in my Android setup.
It doesn't actually prevent me from running the app on android, it just seems to happen during editor work, without even pressing play. (exception occurs about 4 times per minute on an idle editor)

 

PS: This is thrown once when opening the project and looks related:

Code (CSharp):

1. Exception thrown when initializing PlayServicesResolver: System.Reflection.AmbiguousMatchException: Ambiguous match found.
2.   at System.RuntimeType.GetMethodImplCommon (System.String name, System.Int32 genericParameterCount, System.Reflection.BindingFlags bindingAttr, System.Reflection.Binder binder, System.Reflection.CallingConventions callConv, System.Type[] types, System.Reflection.ParameterModifier[] modifiers) [0x00050] in <202f8c081a504aa2940103428e3fd66b>:0
3.   at System.RuntimeType.GetMethodImpl (System.String name, System.Reflection.BindingFlags bindingAttr, System.Reflection.Binder binder, System.Reflection.CallingConventions callConv, System.Type[] types, System.Reflection.ParameterModifier[] modifiers) [0x00000] in <202f8c081a504aa2940103428e3fd66b>:0
4.   at System.Type.GetMethod (System.String name, System.Reflection.BindingFlags bindingAttr) [0x0000e] in <202f8c081a504aa2940103428e3fd66b>:0
5.   at System.Type.GetMethod (System.String name) [0x00000] in <202f8c081a504aa2940103428e3fd66b>:0
6.   at GooglePlayServices.UnityCompat.GetUnity56AndAboveApplicationIdentifier (UnityEditor.BuildTarget buildTarget) [0x00000] in <6161ea2c3dc848909cf65dd754b884ec>:0
7.   at GooglePlayServices.UnityCompat.GetApplicationId (UnityEditor.BuildTarget buildTarget) [0x00000] in <6161ea2c3dc848909cf65dd754b884ec>:0
8.   at GooglePlayServices.PlayServicesResolver.GetAndroidApplicationId () [0x00000] in <6161ea2c3dc848909cf65dd754b884ec>:0
9.   at GooglePlayServices.PlayServicesResolver.OnSettingsChanged () [0x00023] in <6161ea2c3dc848909cf65dd754b884ec>:0
10.   at GooglePlayServices.PlayServicesResolver.Initialize () [0x00070] in <6161ea2c3dc848909cf65dd754b884ec>:0
11.   at Google.EditorInitializer+<InitializeOnMainThread>c__AnonStorey1.<>m__2 () [0x00024] in <410925f9ec0e4665a3bd447b45d44b10>:0
12. UnityEngine.Debug:LogError (object)
13. Google.Logger:Log (string,Google.LogLevel)
14. Google.EditorInitializer/<InitializeOnMainThread>c__AnonStorey1:<>m__2 ()
15. Google.RunOnMainThread:ExecutePollingJobs ()
16. Google.RunOnMainThread:<ExecuteAllUnnested>m__12 ()
17. Google.RunOnMainThread:RunAction (System.Action)
18. Google.RunOnMainThread:ExecuteAllUnnested (bool)
19. Google.RunOnMainThread:ExecuteAll ()
20. UnityEditor.EditorApplication:Internal_CallUpdateFunctions () (at /Users/bokken/buildslave/unity/build/Editor/Mono/EditorApplication.cs:356)
21.  

 

I've updated my project to 2021.2 and got this.

 

I fix it by importing "external-dependency-manager-1.2.167.unitypackage" into the project.

You can get it here
https://github.com/googlesamples/unity-jar-resolver