Reporting a bug in-game means that it may well be fixed sooner, as the reports are easier to manage and get directly introduced into the workflow.
Here is how to do so (as of update 47).
YOU MUST BE LOGGED INTO YOUR SWDTEAM ACCOUNT TO SEND THE REPORT
1. Open the 'Report DM Bug' GUI
2. Fill in the form
Give a short summary of the bug (title), and then provide a more in-depth description. If you have an image to display the bug, please provide a direct link to the image, having been uploaded to an image hosting website.
3. Send the report
Press 'Report Bug' to send the report.
How do you do this on update 57.1, as I can't find where to report in-game bugs.