On public release, Catalina v10.15.1 - I have the same issue using three DIFFERENT FTDI cables. If you use a 3rd party app or screen and attempt to opent the port, it will fail and will get logged accordingly
robert1356
Users receive reputation points by contributing quality content to the forums.
Posts include post and replies published on the forums.
Post authors can mark replies as Accepted to indicate successful solutions.
Apple Developer Forums admins can mark replies as Apple Recommended to indicate an approved solution
Last seen
User for
Post
Replies
Boosts
Views
Activity
Using public v10.15.1 if you install FTDI's latest VCP 2.4.2 driver, it works around this problem.