This is considered an issue. This is why I have logged it on our feedback portal. You can track its progress, subscribe to status changes and add your comment to it here. I have updated your Telerik points as well.
Unfortunately due to the nature of the issue, I cannot suggest a workaround for it. What I can suggest is to inherit the RichTextEditorRibbonBar and override the method that shows the table tabs:
class CustomRichTextEditorRibbonBar : RichTextEditorRibbonBar
protected override void HandleTableStylePropertiesOnCurrentEditingStyleChanged()
Paragraph p = this.GetCurrentParagraph();
if (p == null)
TableCell cell = p.Parent as TableCell;
var isInRange = this.associatedRichTextEditor.Document.GetContainingAnnotationRanges<ReadOnlyRangeStart>(p.Inlines.First);
Let me know if you have any other questions.
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