Thank you for the provided information and fo the bug report with the attached log file.
May I please clarify with you if all the projects where the issue is reproduced are related to the same Salesforce Organization or Sandboxes of the same Org?
While our developers are looking for a reason for the issue, I kindly ask you to the check if any process on your Organization can block reports files for downloading to your TWS projects. One of the possible ways to do this is to cancel deployment processes on the Org.
If this case is acceptable for you, you can do this using the steps below:
1. please open Developer Console for your Organization, in the 'Progress' tab in the bottom you will see the list of processes.
2. in the 'Progress' tab in the bottom you will see the list of processes;
3. please click 'Cancel All Deployments'; After this, you can download a production project to your solution.
4. after this, please pull your reports in The Welkin Suite again.
Please let me know if this helps to solve the issue related to adding reports metadata files to your TWs project. Also, we would greatly appreciate if you could share with us the list or types of the processes which were launch on the Org and blocked reports for downloading.
Thank you for your collaboration.