Trigger update on null too
MODIFY
WalletWasabi.Gui/Controls/WalletExplorer/SendControlViewModel.cs
WalletWasabi.Gui/Controls/WalletExplorer/SendControlViewModel.cs
@@ -873,7 +873,6 @@ namespace WalletWasabi.Gui.Controls.WalletExplorer
{
Observable
.FromEventPattern<AllFeeEstimate>(Global.FeeProviders, nameof(Global.FeeProviders.AllFeeEstimateChanged))
- .Select(x => x.EventArgs is { })
.ObserveOn(RxApp.MainThreadScheduler)
.Subscribe(_ => this.RaisePropertyChanged(nameof(IsEstimateAvailable)))
.DisposeWith(disposables);

Trigger update on null too