Copy and paste error in Dreamweaver CC 2020

Update:

The problem disappeared with a restart (of Dreamweaver, not my PC). I haven’t been able to replicate/recreate the error again. The error has occurred on a couple of occasions in the past and it has been somewhat problematic when I failed to notice that the exact code I intended to copy had not copied correctly.

The problem is unique to Dreamweaver - Testing the copy in another application at the time did not produce an error.

I am satisfied that restarting Dreamweaver will set everything right again – I will just be more vigilant in the future in ensuring that the desired copy area has been pasted as intended.

Sorry, I prefer not to download untrusted files. The best practice in this public forum is to post video on YouTube.  Click the Film strip icon to add video directly to your reply.  When prompted, paste the YouTube URL and click Preview.

Copying code in DW works for me.  I can't reproduce your problem with DW 20.1, build 15211, latest Win10 (1903) and error-free code. 

• Is the problem unique to DW or does it happen with other apps too?
• Does it happen with all sites and files or just certain ones?
• Have you tried restoring preferences?
  https://helpx.adobe.com/dreamweaver/kb/restore-preferences-dreamweaver.html