The text is cut off at the end of characters when the impact font is used.

As a result, the track changes are visualized but not functioning properly.

DrawingML StyleMatrix indices are 1 based, but when a 0 index is provided, the property should receive a value of null.

Let's have a document with a paragraph with only one span which contains a single space character and a table below that paragraph. Position the caret right after the space in the paragraph and press the delete key. The result is that the layout stops updating i.e. clicking anywhere does not visually move the caret, writing something shows as only spaces are added. If the document is forcefully refreshed (by scrolling down and then up again) the changes are reflected.

Copy Content and paste in comment causes Stackoverflow Exception 

In this feature, the existing text is overridden as the user types on it with the "Insert" key is pressed on the keyboard.

Workaround: Track the state of the Insert key and delete before inserting content using the KeyDown and CommandExecuting events:

In word, the focus is transferred to the Find and Replace dialog immediately after opening it.

In the RichTextBox control the focus is not set to the dialog when open. Selecting a word does properly add it to the dialog.

The HTML is not properly escaped and the writer throws InvalidOperationException.

Validation visualization resets to show that contents are valid when a new validation error is added to an already failing state.

Create a shortcut for deleting the entire word before the caret, such  as the Ctrl+Backspace one available in MS Word.

Typing in Korean repeats symbols at the end. This breaks the input and the user is unable to enter the text desired.

The PlaceholderText of Content Control should be restored when the content is deleted and the icon is clicked. 

When there is a table and a paragraph in the header, the added watermark appears multiple times.

RichTextBox: The RepeatButtonStyle is not merged in the RichTextBox Xaml file when declaring the styles on a window level.

 

Workaround: Add the dictionaries to the App.xaml file instead of the Window file.

The editor used for the footnotes causes ArgumentNullException when trying to pass the dialog to it.

Merge undo commands when typing consecutive text. In Word when typing continuous text (without changing the caret position) it is added as only one undo step. In RichTextBox every keystroke (or multiple keystrokes with less than 15 milliseconds in delay) is added as separate undo steps.

Internal exception of type NullReferenceException is thrown when the field has an empty code fragment.

German localization for Automatic color is wrong in the Table border dialog.

The dialogs are not inheriting the theme correctly/fully.

The MS Word has a context menu option Remove Content Control which is missing in the RadRichTextBox UI.