Why does Locale=en_US mess up Emoji?

[jednano]

Default Locale

Locale=en_US

Configuration

ThemeFile=dracula
Transparency=low
OpaqueWhenFocused=yes
CursorType=block
CursorBlink=yes
Font=Fira Code Medium
FontHeight=34
FontWeight=500
FontSmoothing=full
AllowBlinking=no
CtrlShiftShortcuts=yes
Columns=71
Rows=21
Scrollbar=None
PgUpDnScroll=yes
Language=en_US
#Locale=en_US
Window=full
Charwidth=unicode
Emojis=emojione
EmojiPlacement=middle

[jednano]

Windows 10 / MINGW64 / xterm. This Bash shell came with git and I launch it directly from GitHub Desktop.

The program I'm running above is emoj.

The theme and fonts are defined in my config, along with all the specific settings I applied, which I included in the OP. But I already dissected that config and revealed that it was the Locale=en_US that was specifically messing up the EmojiOne emoji.

[mintty]

Because Emojis cannot be encoded in non-Unicode locales.
Try en_US.UTF-8.

[jednano]

Totally works! Thanks @mintty!