Steps to reproduce:
Indeed, it turned out that we missed that scenario as the flow in similar cases differs from the one that usually applies for inserting tables. To keep a clean history, I created another report for that behavior. Please, follow this public item for updates on the matter: RichTextBox: Pasting a table inside of content with track changes, only the text inside the first cell text is styled as new text.
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The problem is not completely solve in LIB 2021.2.525.
Try the following scenario:
It looks like it missing something to start the change tracking markup outside the preceding changes markup or to embed the new markups inside the preceding markup.