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describe the bug that you have found and what you would expect to happen
instead.

System

OS: macOS
Version: alacritty 0.12.2 (9d9982d)

LANG env not set after startup，works fine in local but after ssh to remote neovim checkhealth complains:

ERROR Locale does not support UTF-8. Unicode characters may not dispaly correctly.
$LANG=C.UTF-8 $LC_ALL=nil $LC_CTYPE=UTF-8

localhost locale output:

LANG=""
LC_COLLATE="C"
LC_CTYPE="UTF-8"
LC_MESSAGES="C"
LC_MONETARY="C"
LC_NUMERIC="C"
LC_TIME="C"
LC_ALL=

Is keep LANG unset a expect behavior ? Not sure about this because seen a merged PR to set $LANG env var using languageCode, countryCode: #1087