Reproducible in 17.1.23.606 - SRD and WRD.
Not reproducible with demo report Product Catalog.

Steps to reproduce the behavior:

1. Create new report
2. Add ToC Section
3. Add textbox item
4. Preview the report

Expected behavior
Textbox is shown.

Actual behavior
System.NullReferenceException: Object reference not set to an instance of an object.
at Telerik.Reporting.Processing.DocumentMap.DetermineNodeVisibilityRecursive(BookmarkNode node)
at Telerik.Reporting.Processing.TocSection.MeasureContent(IMeasureContext context, SizeLU availableClientSize)
at Telerik.Reporting.Processing.LayoutElement.MeasureCore(IMeasureContext context, SizeLU availableSize)
at Telerik.Reporting.Processing.VisualElement.MeasureCore(IMeasureContext context, SizeLU availableSize)
at Telerik.Reporting.Processing.ProcessingElement.MeasureCore(IMeasureContext context, SizeLU availableSize)
at Telerik.Reporting.Processing.StackLayout.MeasureContent(IMeasureContext context, SizeLU availableClientSize)
at Telerik.Reporting.Processing.Group.MeasureContent(IMeasureContext context, SizeLU availableClientSize)
at Telerik.Reporting.Processing.LayoutElement.MeasureCore(IMeasureContext context, SizeLU availableSize)
at Telerik.Reporting.Processing.VisualElement.MeasureCore(IMeasureContext context, SizeLU availableSize)
at Telerik.Reporting.Processing.ProcessingElement.MeasureCore(IMeasureContext context, SizeLU availableSize)
at Telerik.Reporting.Processing.StackLayout.MeasureContent(IMeasureContext context, SizeLU availableClientSize)
at Telerik.Reporting.Processing.Report.MeasureContent(IMeasureContext context, SizeLU availableClientSize)
at Telerik.Reporting.Processing.LayoutElement.MeasureCore(IMeasureContext context, SizeLU availableSize)
at Telerik.Reporting.Processing.VisualElement.MeasureCore(IMeasureContext context, SizeLU availableSize)
at Telerik.Reporting.Processing.ProcessingElement.MeasureCore(IMeasureContext context, SizeLU availableSize)
at Telerik.Reporting.Processing.LayoutElement.Measure(IMeasureContext context, SizeLU availableSize)
at Telerik.Reporting.Processing.LayoutElement.MeasureElement(LayoutElement elementToMeasure, SizeLU availableSize, IMeasureContext context)
at Telerik.Reporting.ImageRendering.ImageReportInteractive.MeasureRootCore(LayoutElement root, PageSettings pageSettings)
at Telerik.Reporting.BaseRendering.RenderingExtensionBase.Render(LayoutElement root, Hashtable renderingContext, Hashtable deviceInfo, CreateStream createStreamCallback, EvaluateHeaderFooterExpressions evalHeaderFooterCallback, PageSettings pageSettings)
at Telerik.Reporting.BaseRendering.RenderingExtensionBase.Render(Report report, Hashtable renderingContext, Hashtable deviceInfo, CreateStream createStreamCallback, EvaluateHeaderFooterExpressions evalHeaderFooterCallback)
at Telerik.Reporting.Processing.ReportProcessor.RenderCore(ExtensionInfo extensionInfo, IList`1 processingReports, Hashtable deviceInfo, IRenderingContext renderingContext, CreateStream createStreamCallback)
at Telerik.ReportViewer.Common.ReportRenderer.Render(ReportRendererArgs args)