Remove existing timezone header before adding the current timezone in HTTP message handlers

framework/src/Volo.Abp.AspNetCore.Components.MauiBlazor/Volo/Abp/AspNetCore/Components/MauiBlazor/AbpMauiBlazorClientHttpMessageHandler.cs

@@ -61,6 +61,7 @@ public class AbpMauiBlazorClientHttpMessageHandler : DelegatingHandler, ITransie
     {
         if (!_currentTimezoneProvider.TimeZone.IsNullOrWhiteSpace())
         {
+            request.Headers.Remove(TimeZoneConsts.DefaultTimeZoneKey);
             request.Headers.Add(TimeZoneConsts.DefaultTimeZoneKey, _currentTimezoneProvider.TimeZone);
         }
 

framework/src/Volo.Abp.AspNetCore.Components.Web/Volo/Abp/AspNetCore/Components/Web/AbpBlazorClientHttpMessageHandler.cs

@@ -105,6 +105,7 @@ public class AbpBlazorClientHttpMessageHandler : DelegatingHandler, ITransientDe
     {
         if (!_currentTimezoneProvider.TimeZone.IsNullOrWhiteSpace())
         {
+            request.Headers.Remove(TimeZoneConsts.DefaultTimeZoneKey);
             request.Headers.Add(TimeZoneConsts.DefaultTimeZoneKey, _currentTimezoneProvider.TimeZone);
         }