This may be duplicated with MCPE-109870.

After updating and launching the game, I can see only the main menu BETA background without any visible buttons. While trying to solve my issue and relaunching the game, I got shapes on main menu which flashed. If I pressed ESC, it showed another darker shape so I realized it was indeed the menu.

The flashing was so bad it left a shadow on my screen panel (see images). I kept the menu on my screen ~2min max, and I didn't thought it can cause that kind a harm and that fast. But this time I was lucky, because after a half hour the shadow mark was almost gone and now I can't see it anymore. 

AMD GPU card, AMD R9 280X and latest softw. and drivers installed

Software Version - 2020.1204.0703.12704
Driver Version - 20.45.01.28-201204a-361901C-RadeonSoftwareAdrenalin2020
Provider - Advanced Micro Devices, Inc.
2D Driver Version - 8.1.1.1634
Direct3D® Version - 9.14.10.01471
OpenGL® Version - 26.20.11000.14757
AMD Audio Driver Version - 10.0.1.16
Vulkan™ Driver Version - 2.0.168
Vulkan™ API Version - 1.2.159
Windows Version - Windows 10 (64 bit)

I found out (from another ticket) how to bypass this with AMD Radeon Software: comment-859385