I am closing this post.
It seems that the issue is resolved.
UPDATE
Unfortunately, we are back to square one. It seems that the fix was reverted.
It is still impossible to use the CData section on this forum.
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Please ignore this question.
I am just testing XML CDATA section in the source code.
So far, this site was not allowing to use XML CDATA section in the source code.
Feedback post: xquery-and-add-image-functionality-is-broken.html
UPDATE, Apr/14/2021
DECLARE @xml XML = N'<root><![CDATA[some text]]></root>';
SELECT @xml;
Hooray! It was fixed and, and it is working now. 😊
I am closing this post.
It seems that the issue is resolved.
UPDATE
Unfortunately, we are back to square one. It seems that the fix was reverted.
It is still impossible to use the CData section on this forum.