So, I learned that apparently, there seems to be a issue here:
C:\Windows\System32 λ gmic echo Mcæäat0 [gmic]./ Start G'MIC interpreter (v.3.3.2). McµΣat0 [gmic]./ End G'MIC interpreter.
What Windows terminal should I use to avoid this?
EDIT: Looks like
Paint.NET local code filter works nicely.
Open image to new tab and see what I mean.