It does if you Ctrl+V, or select paste from the edit menu. Right-clicking must assume focus on the document where you clicked and not the actual text box.
That's because Xara has now already been told what the object you just pasted in actually is. This is normal behaviour.
What are you doing to cause this? Text columns that are empty vanish (intentionally), but text boxes don't.
I assume it goes red to tell you theres text in there (as opposed to text that's white and thus invisible).
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