MudDialog与MudDropZone协同异常：移除操作无法同时生效

我实现了一个带拖拽功能的列表，每个列表项都配有编辑按钮，点击按钮会打开MudDialog：

private HashSet<SectionDropZoneItem> visible = new HashSet<SectionDropZoneItem>();
private void OpenDialog(SectionDropZoneItem context)
{
    visible.Add(context);       
    SectionMudDropContainerRef.Refresh();
}

对应的更新方法如下：

async Task Update(SectionDropZoneItem context)
{
    Section newSection = new Section { Name = newName, Description = newDescription };
    var oldSection = await repo.Section.GetAsync(context.Id);
    try
    {
        await repo.Section.UpdateAsync(newSection, oldSection);
        _sectionItems.Add(new SectionDropZoneItem { Zone = "Aktív modulok", Name = newName, Description = newDescription, DepartmentId = context.DepartmentId, DocumentId = context.DocumentId, Position = context.Position });
        _sectionItems.Remove(context);
        visible.Remove(context);
    }
    catch (Exception ex)
    {
        throw ex;
    }

    SectionMudDropContainerRef.Refresh();
}

目前遇到的问题是：_sectionItems.Remove(context)和visible.Remove(context)无法同时执行成功。单独执行其中任意一个都能正常工作，但两者同时执行时就会触发异常。我推测问题根源在于被操作的context对象本身。

补充相关组件代码：

<MudButton Class="" Variant="Variant.Filled" Color="Color.Primary" OnClick="() => OpenDialog(context)" StartIcon="@MudBlazor.Icons.Material.Filled.Edit">编辑</MudButton>
<MudDialog IsVisible="visible.Contains(context)" Options="dialogOptions">                                                
    <TitleContent>
        <MudText Typo="Typo.h6">
            <MudIcon Icon="@Icons.Material.Filled.Edit" Class="mr-3" /> 编辑@context.Name
        </MudText>
    </TitleContent>
    <DialogContent>
        <MudTextField T="String" Value="@context.Name" ValueChanged="(string text) => newName = text" Label="名称" Variant="Variant.Text" Required="true"/>
        <MudTextField T="String" Value="@context.Description" ValueChanged="(string text) => newDescription = text" Label="描述" Variant="Variant.Text" />                                                        
    </DialogContent>
    <DialogActions>
        <MudButton Variant="Variant.Filled" Color="Color.Primary" OnClick="(() => Close(context))" Class="px-10">关闭</MudButton>
        <MudButton Variant="Variant.Filled" Color="Color.Primary" OnClick="(() => Update(context))" Class="px-10">更新</MudButton>
    </DialogActions>
</MudDialog>

private class SectionDropZoneItem
{
    public string Zone { get; set; }
    public string Name { get; init; }
    public int DepartmentId { get; init; }
    public int DocumentId { get; init; }
    public string Description { get; init; }
    public int Position { get; set; }
    public int Id { get; set; }
}

内容的提问来源于stack exchange，提问作者maruzsam