Catalina Keeps Showing Warning "Source.app Will Damage Your Computer. You Should Move It To The Trash."

Update - I now think that clicking on the move to trash button wasn't actually moving anything to the trash. Since posting the above I have gone into Finder and successfully searched for and found the "source.app" file wherever it happened to be and now dragged it to the trash and emptied the trash so I think it is now gone. I think we can consider this problem resolved but if it does continue to recur I'll post again with another update.

Well it has not recurred for me since my last post so I think I did solve it for myself. I am not sure myself whether I might have done some "wrong" things in my initial attempts and I'm not sure just how or where you are searching (Finder? Spotlight search?) but I can tell you that ultimately I did the following:

1) Opened Finder.

2) Typed "source.app" (no quotes) in the search field at the top of Finder.

3) The offending file showed up as the search result and I clicked and dragged it to the trash and then emptied the trash.

Also note - and I don't know whether it is necessary to be able to access this file - but I was using an account with Administrator privileges (which you most likely are if this is your personal Mac and you were the one who initially set it up).