This is on Windows 10 with hotfix 2 installed.
Steps to reproduce are simple:
- Single left click on down arrow icon -> dropdown list appears.
- Single left click on one of the files in the list -> current tab switches to selected file but the dropdown list doesn't go away. Also, the previously active file remains bold in the dropdown list. In 27.0.0 the dropdown list would go away at this point.
This same issue is observed when starting from a default configuration.