How to solve "A Native Collection has not been disposed, resulting in a memory leak." in my case?

Hello everyone,

after finally switching my project to Unity Version 2021, I often got this message in the console:

A Native Collection has not been disposed, resulting in a memory leak.Enable full stacktraces to get more details.

I managed to enable that by importing com.unity.entities and now the console looks like this:

A Native Collection has not been disposed, resulting in a memory leak. Allocated from: Unity.Collections.NativeArray`1:.ctor(Byte[], Allocator) UnityEngine.Networking.UploadHandlerRaw:.ctor(Byte[]) UnityEngine.Networking.UnityWebRequest:SetupPost(UnityWebRequest, WWWForm) UnityEngine.Networking.UnityWebRequest:Post(String, WWWForm) System.Reflection.MonoMethod:InternalInvoke(Object, Object[], Exception&) System.Reflection.MonoMethod:Invoke(Object, BindingFlags, Binder, Object[], CultureInfo) System.Reflection.MethodBase:Invoke(Object, Object[]) Google.PortableWebRequest:StartRequest(HttpMethod, String, IDictionary`2, WWWForm) (at /Users/chkuang/Workspace/Git/unity-jar-resolver/source/VersionHandlerImpl/src/PortableWebRequest.cs:481) Google.c_AnonStorey6:<>mC() (at /Users/chkuang/Workspace/Git/unity-jar-resolver/source/VersionHandlerImpl/src/PortableWebRequest.cs:443) Google.RunOnMainThread:ExecuteNext() (at /Users/chkuang/Workspace/Git/unity-jar-resolver/source/VersionHandlerImpl/src/RunOnMainThread.cs:486) Google.RunOnMainThread:m_12() (at /Users/chkuang/Workspace/Git/unity-jar-resolver/source/VersionHandlerImpl/src/RunOnMainThread.cs:536) Google.RunOnMainThread:RunAction(Action) (at /Users/chkuang/Workspace/Git/unity-jar-resolver/source/VersionHandlerImpl/src/RunOnMainThread.cs:343) Google.RunOnMainThread:ExecuteAllUnnested(Boolean) (at /Users/chkuang/Workspace/Git/unity-jar-resolver/source/VersionHandlerImpl/src/RunOnMainThread.cs:530) Google.RunOnMainThread:ExecuteAll() (at /Users/chkuang/Workspace/Git/unity-jar-resolver/source/VersionHandlerImpl/src/RunOnMainThread.cs:512) UnityEditor.EditorApplication:Internal_CallUpdateFunctions()

The message appers sometimes even multiple times in the console. Unfortunatly that doesn't help me. Can anyone tell me what to do now?