Operating system: Windows-10-10.0.19041-SP0 64 Bits
Graphics card: GeForce GTX 1060/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 452.06
Broken: version: 2.90.0, branch: master, commit date: 2020-08-31 11:26, hash: rB0330d1af29c0
Broken by win10 2004 update
Short description of error
The first letter of Chinese will always be repeated after typing it !
Exact steps for others to reproduce the error
The steps of adding input method in Windows 10
Press Ctrl+i to enter settings in Windows 10, and then type (language settings) in the search bar.
And then follow the pictures below.
To reproduce the typing problems, you can press Win+Space to switch input method to Chinese Simplified.
After that, you can try to type anything you want in blender in any areas, then you will see the problems occur.