It could be that the glyph is not rendering from FiraCode itself, but via a fallback font, and your fallback fonts are configured differently in the different environments. (The Windows console does not support fallback fonts at all: see here.)
It could be that the glyph is not rendering from FiraCode itself, but via a fallback font, and your fallback fonts are configured differently in the different environments. (The Windows console does not support fallback fonts at all: see here.)