Unable to set "E" key in keyboard settings

Summary:

Unable to set "E" key in keyboard settings. All other keys work fine. Bugs not observed in version 1.16.220.

Steps to reproduce:

1. Go to Settings > Keyboard & Mouse.
2. Try changing the key to the letter "E".

Observed results:

Can't change the key to the letter "E".

Expected results:

All keys must be installed.