I tried testing with other CYW20719 based CYBT-423028 module and could face the problems you are facing regarding UART logs and functioning. I have started discussion internally on high priority, will soon update you with more information.
Thank you for pointing out this problem.!
I haven't seen any update on this topic? Is there a forecast for this bug-fix?
BTW, is there a workaround be able to work with the current version of wiced studio?
This issue will be fixed in next WICED SDK release. Our team is already working on this issue.
Till then, you can follow procedure inWICED Studio: Platform Files for CYBT-423028-EVAL - KBA223637 and program the module.