Problem:
I connected a Razer Core X with an AMD Vega 64 (inside) to my MacBook 13, 2018 (i7, Iris Pro 655) via TB3. An external Display LG 43UD79 is already linked via DisplayPort-Cable to the Razer Core X.
When I boot, it takes a few seconds to identify the external monitor, then I'm allowed to login I via the external monitor. In the meanwhile the internal display freezed at the boot-logo of windows and its starts to flicker.
I can play games and use all applications via the external monitor - full usage use of windows 10, BUT my internal MacBook Display just stays at the boot logo (windows) and flickers.