Here are some possible solutions for you to have a try!
In this case, its a good option to take the game file out of Windows 8 compatibility mode.
To do so:
Step 1.
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Locate the executable file of Monster Hunter Wilds and right-press it to chooseProperties.
In theCompatibilitymode, uncheckRun this program in compatibility mode forand then apply the changes.
Repeat the same steps to stop run Steams executable in compatibility mode.

Finally, launch this game once more to see if Monster Hunter Wilds screen flashing is gone.
If your driver is not up to date, some screen issues might appear.
As a result, updating the graphics driver might be a remedy.

Heres how tocheck for game file integrity in Steamand repair it:
Step 1.
FindMonster Hunter Wildsand right-punch it to chooseProperties.
In theLocal Filessection, click onVerify integrity of game filesto start the verification.
Meanwhile, we also look forward to getting some official workarounds from the game developers.
Have a nice gaming experience!