Unusual 3rd-party keyboard layout issue; Can't type digits with Shift in Neovim in PowerShell?

Environment

Windows build number: 10.0.19033.0
Windows Terminal version (if applicable): 0.7.3382.0 (but it's reproduceable in earlier builds too)

Neovim: 0.4.2
PowerShell Core: 7.0.0-preview.6
Universal keyboard layout: https://github.com/braindefender/universal-layout

Steps to reproduce

1. Start Terminal with PowerShell Core.
2. Start Neovim.
3. Switch to insert mode (press i).
4. Type any digit by holding Shift and pressing a key with a digit on it. Like 3.

Expected behavior

The digit is typed.

Actual behavior

Nothing is typed.

Additional information

I can type digits in WSL2 Ubuntu. The rest of the setup is the same.

I also can type digits in plain PowerShell Core, without Neovim.

Also, I can type digits in Neovim under PowerShell Core if I run it not in Windows Terminal, i.e. if I run the regular old school terminal.

Also, I can type digits in Vim instead of Neovim.

Start by reproducing the issue in Windows Terminal with PowerShell Core and Neovim, using the listed Windows build and universal keyboard layout. Compare shifted-digit input in Neovim, Vim, plain PowerShell, WSL2, and the old terminal; done means shifted digits type correctly in the reported Windows Terminal setup.