AutoCAD command stretch helps to stretch components like Pipe.This command should be used with care to get correct results.
Often when selecting the pipe to be stretched it can be moved by selected by manually selecting the Pipe.
After the command has been executed use the mouse to select the component using "Crossing Window method".
Please see below the correct method.
Also, see below the results after the command is run with the correct results
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Thank you for your suggestion and improving the post.
I have used the correct terminology as per your request.