WT can not "see" directories/env variables starting with capital letters

### Windows Terminal version

1.22.10731.0

### Windows build number

10.0.19045.5608

### Other Software

_No response_

### Steps to reproduce

Scenario 1
1. Create a directory Εκλογές at C:\
2. Try to tab complete writing for example cd \Ε followed by tab, where 'E' is the capital greek letter epsilon

Scenario 2
In scenario 2I'm trying to print the content of environment variable $Env:ALLUSERSPROFILE.
1, With a terminal open (set to powershell) press $ followed by english capital letter E

### Expected Behavior

Scenario 1
Tab should auto-complete c:\E το c:\Εκλογές

Scenario 2
Pressing $ produces the character on screen, pressing capital E produces E

### Actual Behavior

Scenario 1
Nothing happens nothing is printed

Scenario 2
Pressing $ produces the character on screen, pressing capital E produces nothing. If small e is pressed it is shown just fine.

Reproduce both scenarios in Windows Terminal using PowerShell, checking Greek and English capital-letter input during path completion and environment-variable entry. Trace the terminal's input and completion handling; done when capital letters work in both cases without breaking lowercase behavior.

Written by the indexing model from the issue text.