DISCLAIMER: Try at your own risk…so please don’t hold me accountable 
Hello Fellow Zwifters,
I just thought I’d share my set-up and workaround regarding the bluetooth issue with Win 10 v1903 and Zwift.
I’ve listed my configuration below and included a link to the YouTube video I created.
Samsung Laptop model Q460 (it has a built in bluetooth, however, I’ve had problems using it so I purchased a USB bluetooth adapter and disabled the onboard one in device manager.)
Asus USB-BT400 USB Adapter (it’s been working flawless for the past month or so)
Windows 10 version 1903 with all the latest updates.
Wahoo KICKR Core with firmware v1.0.11 (released on Sept 4th) which enabled the onboard cadence sensor
Topeak Panobike BLE heartrate monitor
YouTube link:
[Win10 v1903 and BLE working on Zwift - YouTube]
OR if you prefer look up the video title " Win10 v1903 and BLE working on Zwift "
Hope this helps. Happy Riding : )