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Problem using Timezones in AppointmentMapping

When trying to use the scenario that the schedule shows the appointment in the client TimeZone I'm having trouble  using the mapping.

My definition is 

                        EndTimeMapping="To"

                        StartTimeMapping="From"

                        StartTimeZoneMapping="TimeZone"

                        EndTimeZoneMapping="TimeZone"

                        SubjectMapping="Title"

                        ColorMapping="Color"

                        IsAllDayMapping="IsBirthday"/>


The object has for example "UTC" or "

W. Europe Standard Time

" in the TimeZone property.

But when accessing the page I get the following error. 


[0:] System.ArgumentException: An item with the same key has already been added. Key: TimeZone

  at System.Collections.Generic.Dictionary`2[TKey,TValue].TryInsert (TKey key, TValue value, System.Collections.Generic.InsertionBehavior behavior) [0x0015a] in /Users/builder/jenkins/workspace/archive-mono/2020-02/android/release/external/corefx/src/Common/src/CoreLib/System/Collections/Generic/Dictionary.cs:572

  at System.Collections.Generic.Dictionary`2[TKey,TValue].Add (TKey key, TValue value) [0x00000] in /Users/builder/jenkins/workspace/archive-mono/2020-02/android/release/external/corefx/src/Common/src/CoreLib/System/Collections/Generic/Dictionary.cs:240

  at Syncfusion.SfSchedule.XForms.Droid.SfScheduleMapping.GetCustomAppointmentProperties (System.Object formsAppointmentObject, System.Collections.Generic.Dictionary`2[TKey,TValue] appointmentProperties, Syncfusion.SfSchedule.XForms.SfSchedule _formSchedule) [0x00118] in <7803b14dc7af478589a818a6d379d6f9>:0

  at Syncfusion.SfSchedule.XForms.Droid.SfScheduleMapping.GetAppointmentRunTimeProperties (System.Object formsAppointmentObject, Syncfusion.SfSchedule.XForms.SfSchedule _formSchedule) [0x00030] in <7803b14dc7af478589a818a6d379d6f9>:0

  at Syncfusion.SfSchedule.XForms.Droid.SfScheduleMapping.Appointments_CollectionChanged (System.Object sender, System.Collections.Specialized.NotifyCollectionChangedEventArgs e) [0x0002e] in <7803b14dc7af478589a818a6d379d6f9>:0

  at (wrapper delegate-invoke) .invoke_void_object_NotifyCollectionChangedEventArgs(object,System.Collections.Specialized.NotifyCollectionChangedEventArgs)

  at System.Collections.ObjectModel.ObservableCollection`1[T].OnCollectionChanged (System.Collections.Specialized.NotifyCollectionChangedEventArgs e) [0x00018] in /Users/builder/jenkins/workspace/archive-mono/2020-02/android/release/external/corefx/src/System.ObjectModel/src/System/Collections/ObjectModel/ObservableCollection.cs:263

  at BoxPlanner.Toolbox.TrulyObservableCollection`1[T].OnCollectionChanged (System.Collections.Specialized.NotifyCollectionChangedEventArgs e) [0x000df] in C:\Users\Micha\source\repos\BoxPlannerMobile\BoxPlanner\BoxPlanner\Toolbox\TrulyObservableCollection.cs:77

  at System.Collections.ObjectModel.ObservableCollection`1[T].OnCollectionChanged (System.Collections.Specialized.NotifyCollectionChangedAction action, System.Object item, System.Int32 index) [0x00000] in /Users/builder/jenkins/workspace/archive-mono/2020-02/android/release/external/corefx/src/System.ObjectModel/src/System/Collections/ObjectModel/ObservableCollection.cs:338

  at System.Collections.ObjectModel.ObservableCollection`1[T].InsertItem (System.Int32 index, T item) [0x0001a] in /Users/builder/jenkins/workspace/archive-mono/2020-02/android/release/external/corefx/src/System.ObjectModel/src/System/Collections/ObjectModel/ObservableCollection.cs:196

  at System.Collections.ObjectModel.Collection`1[T].Add (T item) [0x00020] in /Users/builder/jenkins/workspace/archive-mono/2020-02/android/release/external/corefx/src/Common/src/CoreLib/System/Collections/ObjectModel/Collection.cs:71

  at BoxPlanner.Views.Pages.Calendar.CalendarPageModel.ExecuteLoadItemsCommand (System.DateTime date, System.Boolean add) [0x0057d] in C:\Users\Micha\source\repos\BoxPlannerMobile\BoxPlanner\BoxPlanner\Views\Pages\Calendar\CalendarPageModel.cs:333