While in debug mode, the solution explorer has a Script Documents section. It is expanded by default. As the debugger runs, new ScriptDocumentxxx poll.txt files a
This is confirmed bug in VS 2019. Just Microsoft is not so fats about fixing it.
https://developercommunity.visualstudio.com/content/idea/351537/provide-a-way-to-prevent-the-script-documents-fold.html