I bought an HDMI/USB-C 4k@60hz adapter. It seems like 60hz is working but my screen goes blank (loses connection) every 2-3 minutes or so.
I have same issue, but my LG4K monitor turns off less often (every 10/15 min) blink's with Satechi Adapter 2xUSB-C to 2x HDMI.. Oddly enough, adapter also connects to the LG 55CX 120Hz OLED panel which does not show this problem.
Unfortunately, both monitors are detected incorrectly:
LG TV SSCR is 55"
LG HDR 4K is 32"
And regardless of whether I connect an original apple adapter or third-party adapter, OSX send incorrect information about displays..
Macbook pro with 64GB RAM 2TB HDD i9 Processor can't display 4k HDR at 60hz!!!!! $4800 for this machine and it can't even run a 4k display!
You right, this is ridiculous, and it looks like Apple can't handle.
Apple should send all of us the original USB-C to HDMI adapters for free (4 usb-c ports, 4 free adapters) !
One more problem I observed, if I turn off and on one of the monitors, something like this appears on the other screen:
The bottom of the screen moves to the top, only after sleeping and waking up the system or restart, everything returns to normal.