This is a vulnerability in the "How to Play" option located in the Settings menu.
This vulnerability only affects Minecraft installations set to Chinese language.
Accurate path (starting from Main Menu, using Simplified Chinese): "设置/游戏指南/百科全书/Minecoins"
After clicking "Minecoins," you should see a page that continuously shakes. This vulnerability occurs when attempting at an 800×600 resolution window, but does not manifest at higher resolutions.
Correction: not UWP, but GDK.