HP EliteBook 855 G7 Ryzen 5 PRO 4650U + Dell U2718Q (27" 4K) - Blinking lines problem 

HP Elitebook:
FAILS: (3840x2160) mini DP (Monitor) → miniDP-to-USBC-adapter → USBC (HP)
FAILS: (3840x2160) standard DP (Monitor) → miniDP-to-USBC-adapter → USBC (HP)
OK: (2560x1440) mini DP (Monitor) → miniDP-to-USBC-adapter → USBC (HP)
OK: (2560x1440) standard DP (Monitor) → miniDP-to-USBC-adapter → USBC (HP)
MacBook:
OK: (3840x2160) mini DP (Monitor) → miniDP-to-USBC-adapter → USBC (MacBook)
OK: (3840x2160) standard DP (Monitor) → miniDP-to-USBC-adapter → USBC (MacBook)
For HP Elitebook I tired with:
- everything disconnected
- everything disconnected except power supply
- other devices connected
- few restarts
- changing performance setup (from low energy to full performance)
Nothing helps :(